Electrical & Instrumentation

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Most liked posts	Author	Posted	Liked	Forum
Earth issue? dull oil light random when driving fixed	Shinnster	Yesterday, 22:51	3 times this week	Electrical & Instrumentation
Twin speed fan tripping (2 switches) 1982 Diesel 1.6	DevonAid	03 Aug 2026, 07:12	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

79145 Views

Last post by Hacksawbob
10 Feb 2013, 23:56
Earth issue? dull oil light random when driving ** fixed**

Last post by Shinnster « Yesterday, 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

224 Views

Last post by Shinnster
Yesterday, 22:51
Electrical Drain! do i start to pull fuses?

Last post by firetrader « 03 Aug 2026, 10:39
Replies: 11
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...

11 Replies

4015 Views

Last post by firetrader
03 Aug 2026, 10:39
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

159 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

104 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

300 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

1593 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

105 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

105 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

142 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

3192 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

870 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

1243 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
1

2
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

2408 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

4555 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

1256 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

2349 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
1

…

7

8

9

10

11
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

223742 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
1

2
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

3000 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

23802 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

1695 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

1845 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

2117 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

1697 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

3333 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

2409 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
1

2
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

9923 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

3049 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

2232 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

4288 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

2014 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

3451 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

5514 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

4580 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
1

2
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

6208 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

130609 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
1

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

16998 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

5395 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

3314 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

2825 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

5257 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

22033 Views

Last post by silverbullet
12 May 2026, 06:32
GlowPlug Issues

Last post by silverbullet « 07 May 2026, 06:41
Replies: 3
by T25ClubJoker » 04 May 2026, 09:48

I've had a little delve into a few different things regarding glow plugs and issues with wiring, relays etc but can't seem to find any advice...

3 Replies

3649 Views

Last post by silverbullet
07 May 2026, 06:41
Oil light flashing, fuel and oil guages not working

Last post by Middle29 « 05 May 2026, 10:54
Replies: 3
by Middle29 » 26 Apr 2026, 11:44

Hello all. Took my starter out to charge it up. When I put it back one of the smaller wires from the alternator had snapped (I think the blue one is...

3 Replies

3632 Views

Last post by Middle29
05 May 2026, 10:54
Brown wire on steering column

Last post by Noah_Blake « 29 Apr 2026, 22:55
Replies: 6
by Beakster » 19 Apr 2026, 19:15

Dropped my steering column down to remove the dash, putting it back in now and insert this broken wire.

There's a wire coming out of the hole in...

6 Replies

6750 Views

Last post by Noah_Blake
29 Apr 2026, 22:55
DLS ignition unit musings

Last post by silverbullet « 29 Apr 2026, 13:57
Replies: 14
by silverbullet » 23 Apr 2026, 11:01

251906083A, manufactred by Telefunken (TLF) or Siemens or AEG. Marked 4-zyl.

I've been thinking a bit about this box of mysteries and what it...

14 Replies

7734 Views

Last post by silverbullet
29 Apr 2026, 13:57
music system

Last post by Robsey « 26 Apr 2026, 20:39
Replies: 3
by Freddievan » 25 Apr 2026, 20:06

I haven't bought a car stereo for 15 years and I'm aware that they're probably quite different to what they were back then. Any...

3 Replies

5633 Views

Last post by Robsey
26 Apr 2026, 20:39
Interior light - Galley

Last post by silverbullet « 26 Apr 2026, 06:47
Replies: 3
by Freddievan » 25 Apr 2026, 11:38

Hi

Shortly after I bought my van, around 13 years ago, my galley light (over the cooker) died. I replaced it with something that looked like the...

3 Replies

4005 Views

Last post by silverbullet
26 Apr 2026, 06:47
pre-1984 fusebox wiring

Last post by Robsey « 23 Apr 2026, 21:56
Replies: 28
by LisaB4 » 21 Jul 2022, 12:51
1

2
Does a simple diagram exist on what colour wire goes in what position on the old type fuse box? I've got a spaghetti mess and no idea what connects...
28 Replies

29976 Views

Last post by Robsey
23 Apr 2026, 21:56
Two spade connectors on starter

Last post by TeeTwenty5 « 23 Apr 2026, 20:27
Replies: 2
by TeeTwenty5 » 23 Apr 2026, 17:59

I have a recon starter to fit but it has two spade connectors, the current one only has one, does anyone know which one I should use for the existing...

2 Replies

4346 Views

Last post by TeeTwenty5
23 Apr 2026, 20:27

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