Electrical & Instrumentation

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Most liked posts	Author	Posted	Liked	Forum
Flashing Coolant LED	PaulFDennis	16 Jul 2025, 09:51	2 times this week	Electrical & Instrumentation
T25 dashboard dimmer switch	syncroandy	12 Jul 2025, 07:39	2 times 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

38840 Views

Last post by Hacksawbob
10 Feb 2013, 23:56
Location of 1.9 DG oil pressure switches

Last post by PaulFDennis « Yesterday, 17:18
Replies: 3
by PaulFDennis » Yesterday, 15:10

I’ve been working on the dash instrumentation on my 1.9 DG engined T25 (1990/91) and found the oil pressure warning LED was removed. On replacing the...

3 Replies

47 Views

Last post by PaulFDennis
Yesterday, 17:18
Sooty plugs all of a sudden….? Summer holiday departure imminent..

Last post by spanishfly « Yesterday, 15:18
Replies: 3
by spanishfly » 17 Jul 2025, 16:19

You know those people you only hear from when they need something…? That appears to be me :oops: .

2.1dj syncro rebuilt by me a few years ago with...

3 Replies

90 Views

Last post by spanishfly
Yesterday, 15:18
Leisure battery advice

Last post by R0B « Yesterday, 12:58
Replies: 34
by Shinnster » 09 Apr 2025, 17:22
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Hi all,

the time has come to get a leisure battery in my van. Ive been using a second car starter battery for the past 2 years which has kind of...
34 Replies

10188 Views

Last post by R0B
Yesterday, 12:58
Electric mirors

Last post by paradox « Yesterday, 11:04

by paradox » Yesterday, 11:04

My Atlantic has electric mirrors but the control knob does nothing.
What fuse and or relay should I be checking first?

0 Replies

23 Views

Last post by paradox
Yesterday, 11:04
pre-1984 fusebox wiring

Last post by Robsey « 17 Jul 2025, 21:52
Replies: 26
by LisaB4 » 21 Jul 2022, 12:51
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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...
26 Replies

6022 Views

Last post by Robsey
17 Jul 2025, 21:52
Flashing Coolant LED

Last post by PaulFDennis « 16 Jul 2025, 09:51
Replies: 40
by Smiffo » 23 Mar 2025, 15:05
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Afternoon all.

Scanned the pages already for ’the' good diagram ( there used to be a good one on Wiki, but that seems empty now. )

Problem as...
40 Replies

15556 Views

Last post by PaulFDennis
16 Jul 2025, 09:51
Dashboard PCB Replacement (CJH Design)

Last post by TwinTurbo « 13 Jul 2025, 20:09
Replies: 94
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...
94 Replies

7582 Views

Last post by TwinTurbo
13 Jul 2025, 20:09
Tried everything I can think of, but still no spark

Last post by ajsimmo « 13 Jul 2025, 09:21
Replies: 7
by zegarek » 10 Jul 2025, 12:34

I'm not after advice for rekindling a marriage (right now), just want to get my T25 back on the road.

I'm at the very modest limits of my knowledge,...

7 Replies

1180 Views

Last post by ajsimmo
13 Jul 2025, 09:21
T25 dashboard dimmer switch

Last post by Mocki « 12 Jul 2025, 11:04
Replies: 6
by MandyJ » 11 Jul 2025, 07:25

Hello, first post, apologies for not knowing technical names for things.

My dad owns a T25 1985 Caravelle that he has maintained for over 20 years....

6 Replies

1658 Views

Last post by Mocki
12 Jul 2025, 11:04
Replace analogue clock with tachometer

Last post by TwinTurbo « 10 Jul 2025, 22:07
Replies: 6
by PaulFDennis » 09 Jul 2025, 11:19

Is it possible to simply replace the analogue clock in the dash with an original VG T25 tachometer? Physically obviously yes but does the wiring loom...

6 Replies

1325 Views

Last post by TwinTurbo
10 Jul 2025, 22:07
Thin blue wire

Last post by TwinTurbo « 09 Jul 2025, 21:15
Replies: 6
by dogbreath100 » 09 Jul 2025, 02:36

Hi , the thin blue wire coming from the alternator has broken on the connector block maybe a foot or so from the alternator. . I cut the block off...

6 Replies

1174 Views

Last post by TwinTurbo
09 Jul 2025, 21:15
Solar, MPPT, Zig CF6, 2nd battery compatibility, t25 2L CU

Last post by Lord-won't-you « 04 Jul 2025, 00:24
Replies: 4
by Lord-won't-you » 28 Jun 2025, 20:21

Hi, I have an '82 t25 2L CU high top camper with a zig CF6, only one starter battery, but there are the cables for the leisure battery (under...

4 Replies

1102 Views

Last post by Lord-won't-you
04 Jul 2025, 00:24
Fuel gauge warning mark. 1.9 petrol

Last post by Aidan « 01 Jul 2025, 12:38
Replies: 1
by RCN » 01 Jul 2025, 11:10

Does anyone know when the needle hits the yellow warning mark how many litres are left or how many miles are left until you hit empty? I never let it...

1 Replies

918 Views

Last post by Aidan
01 Jul 2025, 12:38
Odometer Km to miles

Last post by Aidan « 28 Jun 2025, 11:16
Replies: 5
by Van Rouge » 28 Jun 2025, 06:53

Hi guys
Can I modify the existing speedo or should I source a clock in miles and set the mileage accordingly?
Many thanks in advance
Kind regards...

5 Replies

1177 Views

Last post by Aidan
28 Jun 2025, 11:16
Do I have a wrong headlight lens? (L/H drive)

Last post by Aidan « 27 Jun 2025, 08:02
Replies: 5
by NoobyNiall » 26 Jun 2025, 15:39

Replacing headlights and noted one of the headlights is different (old one) than the other (new one)
Should they be similar?

edited to show...

5 Replies

1106 Views

Last post by Aidan
27 Jun 2025, 08:02
Trickle charger recommendations

Last post by colinthefox « 26 Jun 2025, 14:09
Replies: 3
by Volchara » 26 Jun 2025, 07:08

Hi all, as the title says I’m looking for a trickle charger for my T3 to keep the battery topped up while it sits on the driveway. Anyone got any...

3 Replies

1045 Views

Last post by colinthefox
26 Jun 2025, 14:09
I've not got the horn

Last post by silverbullet « 26 Jun 2025, 07:46
Replies: 5
by silverbullet » 22 Jun 2025, 14:38

Come again? ;)

Final bits of the rebuild, added twin horns, thought that I should test them before adding the OEM relay arrangement.

Horns don't...

5 Replies

1174 Views

Last post by silverbullet
26 Jun 2025, 07:46
Does anyone know the operation of the DOPS module.

Last post by Robsey « 24 Jun 2025, 17:59
Replies: 1
by TwinTurbo » 24 Jun 2025, 13:14

Looking to re-create the DOPS.

Does anyone have a table of RPM vs Switch Status = Action?

Cheers

Rob

1 Replies

995 Views

Last post by Robsey
24 Jun 2025, 17:59
Length of battery positive cable?

Last post by Aidan « 23 Jun 2025, 10:43
Replies: 4
by PaulF » 19 Jun 2025, 19:24

Hi, can anyone tell me the length and cross sectional area for the battery positive lead between battery and starter motor please?
I need to order a...

4 Replies

1090 Views

Last post by Aidan
23 Jun 2025, 10:43
Coil

Last post by Freddievan « 22 Jun 2025, 16:30
Replies: 6
by Freddievan » 27 Jan 2025, 14:17

I've had intermittent issues with ignition, which was traced to the coil connections. The connectors have been cleaned and tightened but the issue...

6 Replies

26030 Views

Last post by Freddievan
22 Jun 2025, 16:30
temp sender wiring

Last post by chrism589 « 19 Jun 2025, 21:03
Replies: 11
by Betty boop 1 » 27 Jun 2021, 17:38

can i start with an apology been quiet for a why as it looked like id been blocked.....thankfully and evidently not temp gauge doesnt work read a lot...

11 Replies

3049 Views

Last post by chrism589
19 Jun 2025, 21:03
Unexpected fuse in slot 3

Last post by cobblers « 18 Jun 2025, 11:29
Replies: 7
by Alfredo » 17 Jun 2025, 18:48

I have a 30A fuse in slot 3 of my fuse box, which according to all sources I can find show it as a 15A fuse?

My 12v cigarette lighter has been...

7 Replies

1232 Views

Last post by cobblers
18 Jun 2025, 11:29
Leisure Battery Wiring Mess.

Last post by maxstu « 16 Jun 2025, 07:59
Replies: 4
by maxstu » 14 Jun 2025, 15:33

12 volt wiring is not my strongpoint. But even this mess is worrying me. Can l use the busbar thingy instead. It's rated to 100 amps so should be...

4 Replies

1058 Views

Last post by maxstu
16 Jun 2025, 07:59
Identify late fan wiring harness

Last post by silverbullet « 09 Jun 2025, 19:16
Replies: 9
by silverbullet » 04 Jun 2025, 19:30

I recently acquired a box of mixed T3 wiring, I have worked out whats what, appears to mostly have come from a '89 Caravelle (going by resistor dates...

9 Replies

1306 Views

Last post by silverbullet
09 Jun 2025, 19:16
Replacement hazard switch

Last post by mariner « 07 Jun 2025, 19:51
Replies: 20
by Profscooter » 14 Nov 2022, 17:36
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My D reg Autosleeper T25 has developed a faulty hazard light switch - only the right side of the van flashed. I ordered a new switch online which was...
20 Replies

3541 Views

Last post by mariner
07 Jun 2025, 19:51
Fixing high beams indicator

Last post by silverbullet « 04 Jun 2025, 19:35
Replies: 2
by Matt_CH » 03 Jun 2025, 14:12

Hi everyone, I just bought my first T25, it's a 1989 Kastenwagen .

One of the problems I had to fix was the broken high beams indicator bulb.
I...

2 Replies

1129 Views

Last post by silverbullet
04 Jun 2025, 19:35
T3 1.6td radiator fan resistor

Last post by Michael c « 01 Jun 2025, 15:01
Replies: 2
by Michael c » 01 Jun 2025, 11:16

Have a T3 1.6td . The radiator fan will only run on high speed when the engine is very hot . Should have 2 speeds. Suspect the resistor behind the...

2 Replies

1062 Views

Last post by Michael c
01 Jun 2025, 15:01
Dash lights.

Last post by BarnyE « 31 May 2025, 19:03

by BarnyE » 31 May 2025, 19:03

I did a stupid thing and put the battery feed to the “little black box” onto the negative terminal in an utter brain dead moment. The diode on the...

0 Replies

2614 Views

Last post by BarnyE
31 May 2025, 19:03
Full beam only on the offside

Last post by pierce « 31 May 2025, 06:59
Replies: 11
by pierce » 23 May 2025, 11:46

Hi when I click the full beam on I only get the right hand light and the near side headlight goes off

Any ideas, I have changed the headlight relay

11 Replies

2101 Views

Last post by pierce
31 May 2025, 06:59
Temperature Guage going to full

Last post by Smiffo « 30 May 2025, 17:15
Replies: 5
by Goose407 » 29 May 2025, 08:12

1.9 DG 1987. Have owned for 20 years. Temperature guage going to full and red light flashing Replaced temp sensor, replaced coolant level sensor...

5 Replies

1249 Views

Last post by Smiffo
30 May 2025, 17:15
T3 fuel gauge

Last post by silverbullet « 30 May 2025, 07:48
Replies: 2
by Komorebi » 29 May 2025, 05:07

Hi guys.
Firstly, electrical is really not my thing so bare with me.
My fuel gauge is playing games with me. When the fuel tank is completely full it...

2 Replies

1086 Views

Last post by silverbullet
30 May 2025, 07:48
Connector for coolant sensor missing - please help

Last post by radiostar « 15 May 2025, 17:04
Replies: 20
by radiostar » 05 May 2025, 10:29
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2
Hi there, I hope you can help me..
I have a 1988 vwt25. I am trying to get back on the road and it’s not far off.
2 things I need help with and they...
20 Replies

5139 Views

Last post by radiostar
15 May 2025, 17:04
JPT Terminal Extraction Tool

Last post by Oldiebut goodie « 14 May 2025, 16:28
Replies: 8
by Alfredo » 13 May 2025, 12:23

Why are these so expensive?

Any tips for a Heath Robinson DIY version

8 Replies

2365 Views

Last post by Oldiebut goodie
14 May 2025, 16:28
1.9 TD AAZ LHD Carthago washer bottle motor

Last post by jacko1967 « 14 May 2025, 15:34
Replies: 2
by jacko1967 » 14 May 2025, 10:35

Hi my washer bottle motor has failed I've checked it on a spare battery and nothing. It was bought about a year ago from brickworks, the van was...

2 Replies

2021 Views

Last post by jacko1967
14 May 2025, 15:34
Engine bay wiring dilema - SORTED

Last post by Dueller « 14 May 2025, 15:30
Replies: 33
by Dueller » 07 Apr 2025, 20:33
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Been busy with my van conversion, gearbox and engine, see my other threads

Now at the stage where i am connecting up

Have some questions though...
33 Replies

11624 Views

Last post by Dueller
14 May 2025, 15:30
Faulty Fuel Gauge - Anyone Else Experiencing This?

Last post by Robsey « 13 May 2025, 21:25
Replies: 1
by gluquestr » 13 May 2025, 20:33

Hi all,
Just wondering if anyone else has had issues with their fuel gauge recently? Mine seems to be acting up - showing as almost empty even after...

1 Replies

1956 Views

Last post by Robsey
13 May 2025, 21:25
Speedometer, fuel gauge, temp gauge not working

Last post by Robsey « 13 May 2025, 19:04
Replies: 10
by FarWare12 » 22 Jan 2024, 20:41

Hi. I recently bought a T25 and the speedometer, odometer, fuel gauge and temp gauge are not working. The warning lights do work.

Could this be one...

10 Replies

6756 Views

Last post by Robsey
13 May 2025, 19:04
Speedo Needle Return Spring

Last post by Aidan « 12 May 2025, 09:46
Replies: 1
by mshaw1980 » 09 May 2025, 19:54

Hello

Been a while since I posted with one thing or another but now back into some spannering on my van.

I previously had a noisy speedo which I...

1 Replies

2317 Views

Last post by Aidan
12 May 2025, 09:46
Vw T25 1980 odometer gear

Last post by R0B « 12 May 2025, 09:44
Replies: 3
by richardhyatt » 12 May 2025, 08:52

good morning,
new to the forum , so hope I have done this correctly
1980 2.0 litre Aircooled T25
my son has the above T25 and the odometer has...

3 Replies

2069 Views

Last post by R0B
12 May 2025, 09:44
No Rear Indicators or Brake Lights - SORTED

Last post by Smiffo « 12 May 2025, 08:40
Replies: 10
by Dueller » 06 May 2025, 17:25

Getting through things and now this

Got a spare earth wire, no idea where it goes

Did have a loose earth on the hazard switch that I repaired...

10 Replies

2955 Views

Last post by Smiffo
12 May 2025, 08:40
Sudden electrical death of washers, wipers, and heater fan.

Last post by Mocki « 12 May 2025, 06:11
Replies: 15
by rollercoaster » 10 May 2025, 17:53
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So it was working recently and all at once not.
Checked the fuses 11 and 13, late van..
Earth crowns look fresh but I'll give them a wiggle.
Any tips...
15 Replies

3861 Views

Last post by Mocki
12 May 2025, 06:11
Wire fallen off back of early T25 fusebox not sure where it goes

Last post by Howardmsmith « 11 May 2025, 11:55
Replies: 3
by Howardmsmith » 09 May 2025, 21:07

21

I have a fairly heavy gauge solid green wire fallen off the back of an early 1983 type 25 fuse box. It think it may have come from fuse position...

3 Replies

2401 Views

Last post by Howardmsmith
11 May 2025, 11:55
Charge light on faintly at low revs

Last post by Aidan « 09 May 2025, 11:59
Replies: 1
by andyk » 09 May 2025, 09:44

Alternator drive belt has just been changed and now the charge light on the dash comes on faintly at low revs. Belt is on tight. Changed the voltage...

1 Replies

2223 Views

Last post by Aidan
09 May 2025, 11:59
Dashboard illumination lights

Last post by AlBundy « 06 May 2025, 20:16
Replies: 17
by AlBundy » 29 Apr 2025, 14:20
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Drove the van at night for the first time in a while, and everything worked, except the dashboard illumination lights. They both used to work, now...
17 Replies

6816 Views

Last post by AlBundy
06 May 2025, 20:16
Ignition coil

Last post by Welshclimber « 06 May 2025, 16:34
Replies: 18
by Welshclimber » 04 May 2025, 08:25
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Looks like my ignition coil is knackered as the ohms aren’t in-line with the spec that they should be. I need the pin type with the grey sticker....
18 Replies

5205 Views

Last post by Welshclimber
06 May 2025, 16:34
Electrical pin release tools

Last post by silverbullet « 06 May 2025, 12:39
Replies: 8
by silverbullet » 28 Apr 2025, 11:03

Recommendations please. I've tried the Durite hexagonal ones (6 tools) and they are poor.
I need tubular ones as well as straight/flat type.
Quality...

8 Replies

4915 Views

Last post by silverbullet
06 May 2025, 12:39
Fridge trips breaker

Last post by EmLu « 04 May 2025, 19:45
Replies: 4
by EmLu » 04 May 2025, 09:45

Good morning guys,

I have recently bought a T25 and thought I would see if the fridge works, when I attached the van to an Electric Hook Up I turned...

4 Replies

2952 Views

Last post by EmLu
04 May 2025, 19:45
3 pin connector underneath alternator

Last post by burnzdog « 04 May 2025, 18:39
Replies: 5
by burnzdog » 02 May 2025, 20:23

Hi all, need to try and replace a cable that comes from rear side of engine bay and connects two a 3 prong connector that appears to go into the...

5 Replies

3639 Views

Last post by burnzdog
04 May 2025, 18:39
Starter ampage

Last post by Robsey « 04 May 2025, 18:27
Replies: 3
by Marmalade67 » 03 May 2025, 15:54

Needing to replace ring connector to solenoid but what amp is required.

3 Replies

3281 Views

Last post by Robsey
04 May 2025, 18:27

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