Electrical & Instrumentation

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Most liked posts	Author	Posted	Liked	Forum
Help with unknown switch	clift_d	12 Aug 2026, 20:12	Once this week	Electrical & Instrumentation

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Last post

Got an electrical fault ? Read this first!

Last post by Hacksawbob « 10 Feb 2013, 23:56

by Hacksawbob » 10 Feb 2013, 23:56

Check your earths !

Many electrical issues are caused by corroded electrical contacts on the earthing points. Please read and check before posting...

0 Replies

79278 Views

Last post by Hacksawbob
10 Feb 2013, 23:56
Replacing the dashboard plastic PCB

Last post by R0B « Yesterday, 15:46
Replies: 448
by MidLifeCrisis » 13 Dec 2013, 13:55
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I just replaced the plastic PCB on my dashboard broadly following Covkid's instuctions in the Wiki;

I thought the PCB layout that I used might be...
448 Replies

318886 Views

Last post by R0B
Yesterday, 15:46
Compressor fridge batttery charging.

Last post by KOTSY « Yesterday, 14:12
Replies: 6
by KOTSY » 17 Aug 2026, 18:37

Hi everyone, I am shortly changing to a compressor fridge with a 120amp. AMG battery . My question is if not using solar ( which hopefully will...

6 Replies

120 Views

Last post by KOTSY
Yesterday, 14:12
Help with unknown switch

Last post by mioba « 14 Aug 2026, 04:34
Replies: 6
by Lillythefrenchie2026 » 12 Aug 2026, 19:41

Bit of a long shot, but does anyone know what this switch activates?

It’s pulling a 12v feed, but tracing the wires they seem to go up and beyond...

6 Replies

162 Views

Last post by mioba
14 Aug 2026, 04:34
Horn Upgrade

Last post by Aidan « 12 Aug 2026, 16:17
Replies: 10
by Lillythefrenchie2026 » 10 Aug 2026, 20:52

Evening all,

The horn on my Auto-Sleeper sounds like a dead mouse being run over and desperately squeezing out its last bit of air. It’s incredibly...

10 Replies

201 Views

Last post by Aidan
12 Aug 2026, 16:17
1.9DG temperature Sender and Sensor

Last post by Aidan « 11 Aug 2026, 19:41
Replies: 1
by keynsham1 » 11 Aug 2026, 19:16

I have a bog standard 1987 1.9DG and I want to replace the temperature gauge sender. In the thermostat housing there are two units, one pointing to...

1 Replies

43 Views

Last post by Aidan
11 Aug 2026, 19:41
Electrical Drain! do i start to pull fuses?

Last post by firetrader « 11 Aug 2026, 16:27
Replies: 12
by NoobyNiall » 18 May 2026, 18:44

Hi All,

The van wasn't started in 4 weeks, found the battery completely dead/ murdered in fact :?

Got a new battery, Van started and started some...

12 Replies

4093 Views

Last post by firetrader
11 Aug 2026, 16:27
Heater floor pannel

Last post by aimlessrock « 11 Aug 2026, 14:09
Replies: 4
by aimlessrock » 10 Aug 2026, 21:23

Folks, I’m trying to retro fit a floor heater pannel into my van.

Anyone have a set of the mounting bolts and rear vent ?

Are the vents supposed...

4 Replies

77 Views

Last post by aimlessrock
11 Aug 2026, 14:09
PCB how do I upgrade with engine conversion.

Last post by Just_Kitt « 11 Aug 2026, 12:27
Replies: 5
by Just_Kitt » 10 Aug 2026, 18:27

Hi all.

I have the classic MkIII golf 2E petrol engine into a 1.9 diesel van conversion (1991 van). The conversation was done before I brought the...

5 Replies

108 Views

Last post by Just_Kitt
11 Aug 2026, 12:27
ignition barrel removal (1984 Holdworth conversion/ petrol 1.9 engine

Last post by gutmeg « 09 Aug 2026, 21:37
Replies: 7
by gutmeg » 09 Aug 2026, 17:43

My ignition key does not go fully in to turn to start engine. I have looked in the barrel and there seems to be a small metal rod floating around. I...

7 Replies

144 Views

Last post by gutmeg
09 Aug 2026, 21:37
Earth issue? dull oil light random when driving ** fixed**

Last post by Shinnster « 08 Aug 2026, 22:51
Replies: 8
by Shinnster » 22 Jul 2026, 23:11

Hi all,

i'm having an issue that i think is the earth from the oil pressure switch but just looking for confirmation really that nothing major is...

8 Replies

291 Views

Last post by Shinnster
08 Aug 2026, 22:51
Twin speed fan tripping (2 switches) 1982 Diesel 1.6

Last post by DevonAid « 03 Aug 2026, 07:12
Replies: 6
by Jonnyb416 » 30 Jul 2026, 20:32

Hi all,

Long time since posting on here. Hoping someone can help please.

For a while I’ve been concerned that my rad fan hasn’t been working,...

6 Replies

182 Views

Last post by DevonAid
03 Aug 2026, 07:12
Odometer intermittently working.

Last post by DavidS « 30 Jul 2026, 08:29
Replies: 2
by DavidS » 29 Jul 2026, 20:27

My odometer stopped working a couple of weeks ago - speedo was fine so it's not the cable at fault.
I looked it up, took the speedo unit apart and...

2 Replies

126 Views

Last post by DavidS
30 Jul 2026, 08:29
Idle valve controller for DJ - repairs

Last post by silverbullet « 29 Jul 2026, 15:26
Replies: 8
by silverbullet » 20 Jul 2026, 12:31

251 907 393 A or C

The one that lives behind your RH rear lamp and is so often forgotten!

I am making enquiries about getting these repaired as I...

8 Replies

313 Views

Last post by silverbullet
29 Jul 2026, 15:26
Leccy Fuel pump and Relay advice

Last post by simonmarsh « 28 Jul 2026, 18:49
Replies: 7
by Stesaw » 06 Jul 2021, 12:56

So before I fit my 2.1 I need to fit a electic fuel pump.
I will be running on carb and I've already got the pump.
I also have a tracker fitted with...

7 Replies

1627 Views

Last post by simonmarsh
28 Jul 2026, 18:49
Fuel solenoid (diesel)

Last post by The Hairy Camper « 28 Jul 2026, 17:37
Replies: 3
by therealchrisgray » 28 Jul 2026, 12:55

Hi all, me again

I've just been through the drama of replacing glow plugs, after tracing a fault that was blowing the 50A fuse. Now the fuel...

3 Replies

115 Views

Last post by The Hairy Camper
28 Jul 2026, 17:37
Hot start relay regular failure

Last post by simonmarsh « 26 Jul 2026, 14:38
Replies: 2
by simonmarsh » 26 Jul 2026, 13:22

Hello everyone-I have replaced the hot start relay 3 or 4 times over approximately 6 or 7 years- they have various brands including Hella. I will...

2 Replies

126 Views

Last post by simonmarsh
26 Jul 2026, 14:38
Ignition barrel not returning key

Last post by mioba « 23 Jul 2026, 19:04
Replies: 3
by mariner » 23 Jul 2026, 13:35

Hi all. Got an issue with my ignition at the mo. When I turn the key the van starts but the key remains in the final ignition spot and needs to be...

3 Replies

153 Views

Last post by mioba
23 Jul 2026, 19:04
LED warning lights for DASH voltage?

Last post by mioba « 22 Jul 2026, 21:24
Replies: 13
by VWKat » 17 Jun 2026, 13:05

Hello good people,
Does anyone know the voltage for the LED Warning lights on the dash? I cannot find this information anywhere.
I am having trouble...

13 Replies

3231 Views

Last post by mioba
22 Jul 2026, 21:24
Another mystery wire

Last post by shampooefficient « 22 Jul 2026, 17:37
Replies: 3
by shampooefficient » 13 Jul 2026, 10:31

Had the van running the other day. Ran very badly and I suspect the timing is out so that's on my list. However I discovered a random pair of wires....

3 Replies

884 Views

Last post by shampooefficient
22 Jul 2026, 17:37
Change headlight switch från 10 pin to 8 pin

Last post by Aidan « 19 Jul 2026, 13:25
Replies: 3
by Andersss » 29 Jun 2026, 11:52

I have a 10-pin headlight switch connector (251 941 531T) on my 1991 1,6 TD Syncro, but the switch has stopped working. As far as I understand, the...

3 Replies

1261 Views

Last post by Aidan
19 Jul 2026, 13:25
Not starting, glow plug issue?

Last post by mioba « 18 Jul 2026, 05:55
Replies: 19
by therealchrisgray » 01 Jul 2026, 14:51
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Hi all, greetings from the Outer Hebrides - where my 1.9 diesel van has decided not to start when cold! (ie every day)

I drove it last week no...
19 Replies

2450 Views

Last post by mioba
18 Jul 2026, 05:55
Wiring diagram

Last post by steveo9007 « 08 Jul 2026, 14:33
Replies: 13
by steveo9007 » 09 Jun 2019, 18:50

Hi everyone,

Can anybody point me in the direction to anywhere on this forum or the web for the wiring diagram for this panel that is attached, i...

13 Replies

4590 Views

Last post by steveo9007
08 Jul 2026, 14:33
Engine cutting out and instrument lights go out

Last post by simonmarsh « 07 Jul 2026, 14:50
Replies: 8
by simonmarsh » 05 Jul 2026, 14:30

Hello everyone- I have an issue with my 1980 cu 2 litre air cooled cutting out. Starts okay but will cut out and both ignition lights go out. I...

8 Replies

1280 Views

Last post by simonmarsh
07 Jul 2026, 14:50
leisure Battery

Last post by hotpod « 07 Jul 2026, 12:17
Replies: 8
by dsa » 30 Jun 2026, 17:36

Can anyone recomend a leisure Battery for under seat fitment if there is one low enough or is it best just to get a standard battery its a standard...

8 Replies

2384 Views

Last post by hotpod
07 Jul 2026, 12:17
Dashboard PCB Replacement (CJH Design)

Last post by firetrader « 04 Jul 2026, 11:08
Replies: 159
by The Hairy Camper » 17 Jun 2025, 10:43
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So, like I'm sure many of you have also experienced by now, the dashboard ribbon on my van is starting to fall apart in a few places. I've ordered a...
159 Replies

224232 Views

Last post by firetrader
04 Jul 2026, 11:08
Indicators staying on not flashing

Last post by firetrader « 03 Jul 2026, 17:58
Replies: 22
by firetrader » 30 Jun 2026, 11:51
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Can anyone help,I have a problem with indicators staying on when operated,not flashing,similarly the hazards do the same, any advice welcomed,tganks
22 Replies

3067 Views

Last post by firetrader
03 Jul 2026, 17:58
Speedo not working

Last post by therealchrisgray « 01 Jul 2026, 11:14
Replies: 2
by therealchrisgray » 16 Jan 2026, 16:33

Hi all, I need a bit of troubleshooting and advice.

I just replaced the speedo cable, but the needle still isn't moving. Does this mean the speedo...

2 Replies

23828 Views

Last post by therealchrisgray
01 Jul 2026, 11:14
Aftermarket Rev Counters

Last post by Shinnster « 30 Jun 2026, 23:04
Replies: 8
by Madmaninshed » 28 Jun 2026, 10:39

Hi, My 1900 DG engined water cooled 1986 van has a 2” aftermarket analogue rev counter, fitted by the last owner. It jumps about, and gives...

8 Replies

1724 Views

Last post by Shinnster
30 Jun 2026, 23:04
Brake lights always on my 1985 T25

Last post by The Hairy Camper « 29 Jun 2026, 20:25
Replies: 8
by jakestroudley » 25 Jun 2026, 21:28

I have a RHD 1985 T25 and the brake lights are staying on full time. I have read a post to see what the issue is, and I think I understand that the...

8 Replies

1877 Views

Last post by The Hairy Camper
29 Jun 2026, 20:25
Speedo

Last post by maxstu « 29 Jun 2026, 17:56
Replies: 4
by Lillythefrenchie2026 » 28 Jun 2026, 14:24

Is it common for T25 speedos to bounce whilst moving, mine jumps about 2-3mph when driving in every gear!

4 Replies

2156 Views

Last post by maxstu
29 Jun 2026, 17:56
2E3 "SERVO" CHOKE.

Last post by tobydog « 20 Jun 2026, 09:50
Replies: 2
by TwinTurbo » 19 Jun 2026, 20:24

Do people generaly find the 2e3 autochoke a bit rubbish?

I am designing a replacement for the auto choke ditching the spring, cams, bi metalic and...

2 Replies

1711 Views

Last post by tobydog
20 Jun 2026, 09:50
1990 1.9 DG Waterboxer replacement rotor arm shorted out?

Last post by tobydog « 17 Jun 2026, 08:02
Replies: 9
by SWTurbo » 11 Jun 2026, 19:39

Fitted a new rotor arm and distributor cap to a 1.9 DG, few miles down the road it broke down and a recovery company said the new rotor arm was...

9 Replies

3359 Views

Last post by tobydog
17 Jun 2026, 08:02
Cu engine not running on lh bank

Last post by silverbullet « 16 Jun 2026, 06:45
Replies: 3
by crazydiamond » 14 Jun 2026, 13:55

Im pulling my hairout.
2LT cu Aircooled
on lpg or petrol, new plugs and leads and tried old leads and plus as well. Found a manifold leak but fixed...

3 Replies

2439 Views

Last post by silverbullet
16 Jun 2026, 06:45
Manifold Heater problem. 1.9 WBX early

Last post by VWKat « 14 Jun 2026, 20:59
Replies: 17
by VWKat » 15 Feb 2018, 15:21
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Hello,

Back again. New day, new problem.

It started out with a small voltage drop, then I couldn't start my van and there was a large voltage...
17 Replies

9996 Views

Last post by VWKat
14 Jun 2026, 20:59
1.9DG - No Spark

Last post by VWKat « 14 Jun 2026, 20:00
Replies: 3
by VWKat » 14 May 2026, 13:18

Hello, returning again - still got my Van, 20+ years - still love it, I'm giving it an overhaul and also a repaint currently, windscreen also needs...

3 Replies

3069 Views

Last post by VWKat
14 Jun 2026, 20:00
LED (DOT approved) Headlights. A question

Last post by mioba « 11 Jun 2026, 17:57
Replies: 3
by THE KESZTHELY KID » 11 Jun 2026, 12:15

I am considering purchasing a set for Bezza, my 1980 Westy. On my failed trip :( to Holland I fitted the 'Beam-Benders' onto Bezza's 7 H4...

3 Replies

2248 Views

Last post by mioba
11 Jun 2026, 17:57
Red oil warning light flashing

Last post by Aidan « 10 Jun 2026, 07:40
Replies: 13
by Madmaninshed » 04 Jun 2026, 10:29

Hi, can anyone help me with this problem please?
our van has just been fully serviced, including new oil and filter. Total mileage is a genuine 56K...

13 Replies

4332 Views

Last post by Aidan
10 Jun 2026, 07:40
Earth for EHU consumer unit

Last post by pirate-pete « 08 Jun 2026, 21:14
Replies: 2
by Lmh2000 » 07 Jun 2026, 11:35

Afternoon all.

I’m having to re-do the EHU electrics as the original German-made 230V RCD/MCB unit (Netzmatic) no longer works. The unit doesn’t...

2 Replies

2030 Views

Last post by pirate-pete
08 Jun 2026, 21:14
Temp gauge not. Working 1.9aaz LHD

Last post by pirate-pete « 04 Jun 2026, 12:29
Replies: 4
by jacko1967 » 20 May 2026, 15:47

Hi to the auto electrician on hear I am afraid I am not one 🤣.
So today I tried to fix my temp gauge I fitted a new brickwerks sensor in the engine...

4 Replies

3479 Views

Last post by pirate-pete
04 Jun 2026, 12:29
Analogue clock completely dead

Last post by Madmaninshed « 04 Jun 2026, 10:56
Replies: 6
by Madmaninshed » 16 May 2026, 13:32

Hi, I read with interest an excellent earlier post showing how to replace the two capacitors that often fail on the analogue dash clocks. His clock...

6 Replies

5543 Views

Last post by Madmaninshed
04 Jun 2026, 10:56
Changed the voltage regulator but where does this go!?

Last post by mioba « 02 Jun 2026, 07:33
Replies: 14
by Samanthington » 28 May 2026, 12:49

Hi all

So I’ve been having electrical problems for a while on the van. I just put it down to being a cheapskate and only buying 2nd hand batteries...

14 Replies

4622 Views

Last post by mioba
02 Jun 2026, 07:33
speedo dial diameter

Last post by jordan01070 « 01 Jun 2026, 19:25
Replies: 18
by jordan01070 » 17 May 2026, 11:07
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HI does anybody know the speedo diameter for a late 1.9 dg petrol engine as the cable has broken again and I am looking at getting a gps speedo, I...
18 Replies

6243 Views

Last post by jordan01070
01 Jun 2026, 19:25
LED (DOT approved) Headlights

Last post by silverbullet « 23 May 2026, 12:58
Replies: 14
by THE KESZTHELY KID » 05 Aug 2025, 12:25

Bueno Estente,

I have seen such as 7 inch LED headlights LAMP fit Land Rover Defender VW T25 T3 Vanagon sealed beam | eBay UK on Fleabay and...

14 Replies

130671 Views

Last post by silverbullet
23 May 2026, 12:58
Starter Cable upgrade

Last post by Simon Baxter « 22 May 2026, 14:32
Replies: 26
by Sir Brixalot » 19 Jun 2018, 18:18
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2
Going to do it as per wikki -Thanks CK.
There is a massive cable clamped on the positive battery post which goes through the floor beneath the seat....
26 Replies

17070 Views

Last post by Simon Baxter
22 May 2026, 14:32
Replacing battery and perhaps upgrading alternator & split charge relay?

Last post by OldNick « 18 May 2026, 21:35

by OldNick » 18 May 2026, 21:35

Hi, I acquired a February 1985 T3 Westfalia Joker (1.9 L petrol engine) last year. I fitted a Bluetti Charger-1 last year to charge a Jackery whilst...

0 Replies

5416 Views

Last post by OldNick
18 May 2026, 21:35
Radio replacement

Last post by Robsey « 15 May 2026, 23:48
Replies: 2
by ParaZiTsp » 15 May 2026, 04:18

Just bought a t3, and the radio is always getting power even when the key is out. Is that normal for t3s or just shoddy wiring? Will it mess anything...

2 Replies

3327 Views

Last post by Robsey
15 May 2026, 23:48
Unknown broken wire - please help identify

Last post by silverbullet « 15 May 2026, 12:44
Replies: 1
by h3nry » 15 May 2026, 08:40

Does anybody know what this red wire is for?

Has a split in the insulation with some temp tape to cover it - as well as a black wire which is...

1 Replies

2841 Views

Last post by silverbullet
15 May 2026, 12:44
PCB Damage Repair Advice

Last post by maxstu « 13 May 2026, 17:42
Replies: 8
by maxstu » 11 May 2026, 19:28

My Autosleeper HAD a perfect blue foil with everything working. But the clock was a bit lazy on some days. And the temp needle a bit higher than it...

8 Replies

5294 Views

Last post by maxstu
13 May 2026, 17:42
Heater blower motor

Last post by silverbullet « 12 May 2026, 06:32
Replies: 7
by Komet_V2 » 14 Mar 2026, 13:31

So, any movement through the blower settings doesn't activate the blower. Can it be anything other than the blower motor. When it went, there was a...

7 Replies

22064 Views

Last post by silverbullet
12 May 2026, 06:32

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