Electrical & Instrumentation

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Most liked posts	Author	Posted	Liked	Forum
Which tab is for flashing headlights?	simonmarsh	10 Oct 2026, 08:37	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

80518 Views

Last post by Hacksawbob
10 Feb 2013, 23:56
Air cooled Heater controls

Last post by Jay Peg « 58 minutes ago
Replies: 2
by Jay Peg » Yesterday, 14:42

Hi,

I’ve recently reinstated my basic heating ducting and all the relevant gubbins, on my T25 ‘81 2.0 cu.
Does anyone have an explanation what the...

2 Replies

53 Views

Last post by Jay Peg
58 minutes ago
Checking Voltage Drop When Upgrading T25 Interior Lights to LEDs

Last post by mioba « 15 Oct 2026, 15:05
Replies: 1
by cedricuk » 15 Oct 2026, 10:59

When upgrading interior lighting on a T25, how do you check whether the existing wiring and connections are suitable for LED replacements?
Would you...

1 Replies

50 Views

Last post by mioba
15 Oct 2026, 15:05
LED lighting for the interior of a T25

Last post by clift_d « 14 Oct 2026, 07:13
Replies: 5
by cedricuk » 08 Oct 2026, 15:59

Hi all,
I'm looking at the different ways people have added LED lighting to the interior of their T25s and was wondering what setups have worked...

5 Replies

186 Views

Last post by clift_d
14 Oct 2026, 07:13
Screen washer not working

Last post by firetrader « 13 Oct 2026, 13:36
Replies: 4
by firetrader » 11 Oct 2026, 17:32

My screen washer has decided to stop working, have looked at fuses (seem ok), no noise coming from the motor? I am assuming the motor is behind the...

4 Replies

103 Views

Last post by firetrader
13 Oct 2026, 13:36
Which tab is for flashing headlights?

Last post by silverbullet « 11 Oct 2026, 09:31
Replies: 3
by simonmarsh » 07 Oct 2026, 18:29

Hello- I recently replaced the ignition switch on my 1980 model which resolved the random cutting out issue but when I removed the ring that houses...

3 Replies

214 Views

Last post by silverbullet
11 Oct 2026, 09:31
axiliary water pump staying on

Last post by mioba « 05 Oct 2026, 21:26
Replies: 1
by morganite » 29 Oct 2024, 17:18

Hi, 1.6 td, my axiliary water pump is staying on and running the battery down, is there a relay somewhere that should shut the water pump down once...

1 Replies

37226 Views

Last post by mioba
05 Oct 2026, 21:26
100A alternator

Last post by Donnybri « 04 Oct 2026, 15:52
Replies: 3
by Donnybri » 03 Oct 2026, 19:11

Hello all,
Does anybody know of a 100A alternator as a direct replacement for the original in a 1.9dg? I’m aware of the 90A but I’m looking for a...

3 Replies

413 Views

Last post by Donnybri
04 Oct 2026, 15:52
This one is puzzling me, what’s your thoughts?

Last post by mioba « 04 Oct 2026, 13:33
Replies: 11
by Woodyyellow » 27 Sep 2026, 14:51

Electrical puzzle?

Engine starts and runs fine, no problems there at all! Water cooling light extinguishes as it should after 4 seconds or so, BUT...

11 Replies

1093 Views

Last post by mioba
04 Oct 2026, 13:33
Switched live from the fuse box

Last post by mioba « 03 Oct 2026, 10:47
Replies: 2
by moojw » 12 Sep 2026, 15:22

Hi all,

Hope you are keeping well, I'm in need of your advise.

The heater blower isn't working, I've traced it to what I think is supposed to be a...

2 Replies

653 Views

Last post by mioba
03 Oct 2026, 10:47
Flasher relay chattering

Last post by mioba « 03 Oct 2026, 10:43
Replies: 8
by Cecil » 12 Sep 2026, 19:27

We are away in the van at the moment and have developed a problem with the flasher relay chattering randomly ,whilst driving but not using...

8 Replies

1054 Views

Last post by mioba
03 Oct 2026, 10:43
Temp gauge sender 1.9dg 1987

Last post by Swebby « 28 Sep 2026, 16:51
Replies: 9
by Swebby » 28 Sep 2026, 09:32

Hi all,
Been a while since I last posted. Have not done much with the van really. Anyway, the temp gauge stopped working the other day. Thought I...

9 Replies

828 Views

Last post by Swebby
28 Sep 2026, 16:51
Hard Start Relay melting Starter Motors

Last post by Blakefruid « 13 Sep 2026, 22:48
Replies: 6
by Blakefruid » 31 Aug 2026, 16:59

Hi all,
As it’s a bank holiday I thought I’d try and fix an old issue on my 1.6JX. I had a hard start relay fitted professionally a couple of years...

6 Replies

905 Views

Last post by Blakefruid
13 Sep 2026, 22:48
Broke my bus

Last post by sarran1955 « 10 Sep 2026, 22:06
Replies: 6
by dbs153 » 10 Sep 2026, 17:47

I’ve only just got my 1981 T25/T3 2000cc cu Aircooled bus and have broke it already.
i was told it would be a good idea to change the plugs, ht...

6 Replies

723 Views

Last post by sarran1955
10 Sep 2026, 22:06
Ecu pinout

Last post by Aidan « 30 Aug 2026, 06:09
Replies: 3
by Stonemonkey » 29 Aug 2026, 19:21

Hi
I have not long bought a T4 with a 044 906 022 E ecu, 2.0l AAC petrol engine. It was not running too well when I drove it home so I decided to...

3 Replies

586 Views

Last post by Aidan
30 Aug 2026, 06:09
Cutting out, not fuel related, 1.6 air cooled

Last post by simonmarsh « 29 Aug 2026, 06:47
Replies: 2
by yosini » 22 Aug 2026, 06:52

Hi, we're mid trip at the moment but cut out 3 times yesterday getting to the campsite. We've had this problem before which I thought was the coil...

2 Replies

774 Views

Last post by simonmarsh
29 Aug 2026, 06:47
Battery drain, help please!

Last post by Alfredo « 28 Aug 2026, 08:22
Replies: 22
by AlBundy » 23 Aug 2026, 20:24
1

2
Hi everyone, I have a 1986 1.6 Diesel that has a battery drain issue.

I have checked for parasitic draw and with the alternator disconnected I get...
22 Replies

1500 Views

Last post by Alfredo
28 Aug 2026, 08:22
Powerspark 034 SVDA

Last post by Lmh2000 « 27 Aug 2026, 18:23
Replies: 2
by Lmh2000 » 26 Aug 2026, 13:03

Hello

I’m looking at replacing my stock distributor with one of these following this awesome tutorial..

In it the original washer from...

2 Replies

705 Views

Last post by Lmh2000
27 Aug 2026, 18:23
Fuel gauge

Last post by hotpod « 27 Aug 2026, 17:04
Replies: 6
by southernscouse » 25 Aug 2026, 10:54

Hi having a problem with the fuel gauge reading empty everything else works ok just the fuel gauge
Van has been fitted with the slaughterhouse...

6 Replies

783 Views

Last post by hotpod
27 Aug 2026, 17:04
behind headlight drivers side

Last post by marktaylor « 25 Aug 2026, 18:57
Replies: 3
by marktaylor » 25 Aug 2026, 15:32

what is the small coil thing behind headlight one side of vw t25 please

3 Replies

680 Views

Last post by marktaylor
25 Aug 2026, 18:57
Help with unknown switch

Last post by mioba « 24 Aug 2026, 20:02
Replies: 8
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...

8 Replies

1035 Views

Last post by mioba
24 Aug 2026, 20:02
Idle valve controller for DJ - repairs

Last post by silverbullet « 21 Aug 2026, 20:18
Replies: 9
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...

9 Replies

1126 Views

Last post by silverbullet
21 Aug 2026, 20:18
Help! New owner!

Last post by mioba « 21 Aug 2026, 19:40
Replies: 2
by VinceVolauvent » 20 Aug 2026, 07:32

Hi all,
Can anyone recommend a good auto electrician in the South East, ideally around Tunbridge Wells / Tonbridge / Kent ?
I’m looking for someone...

2 Replies

705 Views

Last post by mioba
21 Aug 2026, 19:40
Replacing westy fluorescent tube with LED tube

Last post by danmetallic « 20 Aug 2026, 17:15
Replies: 50
by danmetallic » 08 Feb 2014, 19:26
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3

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Any ideas how I can break into this westy light and rewire so I can use a LED tube?
50 Replies

23787 Views

Last post by danmetallic
20 Aug 2026, 17:15
1.9DG temperature Sender and Sensor

Last post by Swebby « 20 Aug 2026, 17:04
Replies: 4
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...

4 Replies

807 Views

Last post by Swebby
20 Aug 2026, 17:04
Replacing the dashboard plastic PCB

Last post by R0B « 18 Aug 2026, 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

330781 Views

Last post by R0B
18 Aug 2026, 15:46
Compressor fridge batttery charging.

Last post by KOTSY « 18 Aug 2026, 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

891 Views

Last post by KOTSY
18 Aug 2026, 14:12
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

1076 Views

Last post by Aidan
12 Aug 2026, 16:17
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

4989 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

729 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

849 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

811 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

1047 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

871 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

751 Views

Last post by DavidS
30 Jul 2026, 08:29
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

2297 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

733 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

682 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

722 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

4058 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

1457 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

1859 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

3527 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

5424 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

2006 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

3158 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

232070 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

4240 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

25061 Views

Last post by therealchrisgray
01 Jul 2026, 11:14

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