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Guest Message by DevFuse
 

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Anybody know their stuff with VW Diesels??


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11 replies to this topic

#1 6 Star

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Posted 12 March 2012 - 04:15 PM

My father has a 1982 VW Diesel Pickup.
Its having a weird electrical bug...

What is normally suposesd to happen:
Turn on key to start the glowplugs
Dummy light/s and dummy light for glowplugs come on
Dummy light for glowplugs shut off when ready
Start car
Off you go.

What is happening now:
Dummy lights come on for a split second
Followed immediately by the Ebrake dummy light coming on
The truck wont start
Once key is removed the Ebrake light stays on, even when the Ebrake is released.
Have to take the positive terminal off the battery to shut the light off.

Anybody know whats happening?

#2 95legwagon

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Posted 12 March 2012 - 04:51 PM

ill look around online for you....im pretty good at that lol

what model is it? i understand its a vw diesel truck but i need the model to really help. :)

#3 davebugs

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Posted 12 March 2012 - 05:00 PM

I believe that is just a little too old to have a ratehr large metal fuse somewhere on the dash to the L of the steering wheel IIR hidden by a cover or jsut underneath the dash.

tdiclub.com is the best site I've found but most of it is the later stuff.

But I'd certainly go there and look.

#4 nipper

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Posted 12 March 2012 - 05:08 PM

This sounds almost like a bad battery or altenator. The E brake light here is a clue.

#5 6 Star

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Posted 12 March 2012 - 05:19 PM

As for a model: its the same thing as a mk1 rabbit, just in pickup form.

Dave: I'll have to look and see if theres a fuse or something there. :D

Nipper: The battery and alternator are both good.

Tested a bunch of things:
Starter from this truck worked when put in another car.
Grounds are all in place and in good contact.
Battery terminals have good contact.
Tested power from battery to glowplug leads when key is on: power going to plugs.

All the fuses under the dash are in order.

My dad talked with someone on the phone and they mentioned that it could be the "interlocking relay alarm safety" which has something to do with the seatbelts?
lol
Thanks everyone for the insight so far. :)

#6 nipper

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Posted 12 March 2012 - 05:34 PM

after grounds (a notorius older VW issue) i was going to say a main relay of some kind. That may be an interlock year.

http://volkswagenown...m/vw/forum.php? try there

#7 95legwagon

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Posted 12 March 2012 - 05:35 PM

is it one of the models that wont start unless you have your seatbelt on?


edit: does it crank but doesnt start or does it not crank at all? also have you tried putting a screwdriver to the starter to see if it will start? (if it doesnt crank) maybe ignition switch is bad.... cant seem to find anything on that interlock thing you were talkn bout....quite a hard search but i did read that those are prone to all kinds of electrical demons lol

Edited by 95legwagon, 12 March 2012 - 05:40 PM.


#8 6 Star

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Posted 12 March 2012 - 05:52 PM

Gonna check out this interlock relay when the weather clears up. Looks like its behind the fuse pannel.

The seatbelts don't have to be on to start the car...
Also we replaced the ignition switch too, since that seemed like what was going on. (We've been fighting this gremlin for about a week now) :lol:

The engine wont crank at all.

#9 tractor pole

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Posted 13 March 2012 - 01:48 AM

Don't know if you already have one of these, but they are a great resource. Kind of spendy though...

http://www.bentleypublishers.com/volkswagen/repair-information/vw-jetta-rabbit-diesel-1977-1984-repair-manual.html

I had one for a gas mk1. it was great for tracking down problems.

Ben

#10 nipper

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Posted 13 March 2012 - 08:53 AM

Try this, if not let me know i will DL it for you and look into it

http://volkswagenown...nd-Repair-Guide...

It is a bit torrent, not sure if it works as i dont have a torrent program on the laptop.

#11 6 Star

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Posted 15 March 2012 - 01:13 AM

I think I have one of those Bently manuals around here somewhere...

Thanks for that link Nipper, I have that saved now. :D
Only problem is it doesn't have a table of contents or index. :\

I've been at work the past few days and my father continued to diagnose the problems. He got it to randomly start after moving some wires around, but the glowplug light on the dash stayed on while running. :eek:
Then he shut it off, tried to start it again, and it was back to just throwing up the Ebrake light.

Fun times. :lol:

#12 6 Star

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Posted 23 March 2012 - 02:40 PM

Turns out it was something really simple. :D
We ran a ground from the battery to the alternator, and it would start every time. However the wire eventually burned up. :eek:
So we instead ran a ground from the existing connection of the battery to frame ground; to the transmission. Working good. :clap:

This is preventing the drain on the battery that was happening.




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