[Vwpickups] glow plug relay

[Eric S]

According to Bentley for 81 Trucks:

Black at pin 86 is switched power (key on)

Red/Black at pin 50 is also switched power (key on) (suspicious about
this, later years pin 50 only gets power when key in start position).

Brown at pin 85 is ground

Black/Yellow at pin "L" is to the light in the dash

Looks like Blue/White (hard to read if thats blue or not) at T pin is to
engine temp sensor

Red/White at pin 87 goes to the glow plugs

Red at pin 30 is constant power from the starter

---

So, if your suspicious of the relay not functioning, pin 30 check for
constant power, pin 86 check for power when key on, and check your
continuity to ground on pin 85.  If that all checks out, then relay could
be bad, or engine temp sensor (or wire) bad.

-- 
Eric
www.vintagewatercooleds.com

1981 Scirocco S (m-TDI swap project)
1991 Cabriolet (2.0 crossflow 8v project)
2000 Audi S4


Peter Kreutzfeldt wrote:
> Anyone have a color diagram for the relay wiring. I must have lost a wire
> driving out to Arizona during the blizzard 3 weeks ago. The roads were
> like wall to wall broken ice chunk potholes. I replaced the relay but no
> power to it. The fuse is OK and the plugs glow when directly connected to
> the battery and the car starts. Like to check the wires to the relay and
> see which one went south.
> I'm away from home and have no manuals with me.
> Thanks
> Peter
>
>
>
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