[DML] Re: Electrical problem

["John Slupski" <slupa@xxxxxxxxxxx>]

HI Guys, I've been working with my electrician father in law on the 
power windows electrical problem that has made the radio, a/c 
illumination lights, and both power windows inoperable.  Here is 
what we found and what we think is happening. Can you more 
experienced guys think about this and see if we are on the right 
track?

We found that the brand new power window switch from DMC was bad and 
shorted power to both sides of the passenger doow window motor at 
the same time.  We think this is what caused the problem to start.

The smoke came from the connector for the passenger power window 
switch to burn.  No wires burned or wire insulation melted, just the 
plastic around the "hot" wire on the power window connector.

The fuse (#11) is good.  We have power at the proper pin on the 
power window switch connector.  We have a good ground at the proper 
pin on the power window switch connector.  All other fuses are good.

When we short the power pin on the power window switch connector to 
one of the pins that goes to the power window motor the motor still 
does not run (even though we know we are shorting power directly to 
the wire to the motor).  This is the case no matter which connector 
we short power to the motor (passenger or driver side).

Our conclusion for this is that the power window motors do not have 
a ground at them to complete the circuit even when we put power 
directly to the motor.

The quandry is...where do the motors get their ground from and why 
is that affecting the a/c illumination circuit?!?

When we check page M:07:01 and M:07:02 in the DeLorean workshop 
manual it shows that Relay 29 is the "A/C Illumination" relay.  And 
when we check page M:18:19 we see the diagram but there is NO 
legend! Are the relays marked as #1, 3, 12, 14, 17 and the part of a 
relay marked #16 all the same relay?  Is it relay #29 referred to on 
page M:07:01 and :02?  We also found an old blog that said that 
the "red relay" which, we think, is on page M:07:01 as number 31, 
labeled "H.R.W. Timer (Green).

Is there a better diagram (with a legend) of the A/C illumination 
circuit?  Or a diagram of the entire electrical system?  It would 
sure be nice to see what is really connected to what and how they 
are connected.

Anyway, we think our next step is to replace the bad power window 
switch and the #31 "A/C Illumination" relay.

Thoughts?


--- In dmcnews@xxxxxxxxxxxxxxx, "johnslupski" <slupa@...> wrote:
>
> New DeLorean owner here - enjoying the highs and lows of owning 
the 
> car.  I'm not a car guy but I'm learning fast.  I'm not an 
> electrician either so I'm hoping for some advice on what I'm sure 
> most owners on this list will see as a relatively simple problem:
> 
> While driving the car, the radio (original Craig) suddenly went 
> off.  From under the power window and defroster switches came some 
> smoke (a fair amount) for a half minute or so and what smelled 
like 
> maybe a burning wire.  Now the radio, power window and defrost 
> switches and A/C lamps are out.  No other problems with any other 
> electrical components and the car runs fine.
> 
> I can replace the fuse easily enough (although it doesn't look 
fried 
> to me) but with my limited knowledge, I'm guessing that's not the 
> source of the problem but just a symptom.  I did replace the power 
> window switches a few days ago and they worked fine but maybe that 
> contributed to this problem in some way?  
> 
> Before I go in and start mucking around like a spider monker 
> disassembling a nuclear device, I'd appreciate any thoughts.  
> 
> Thanks,
> 
> John
> VIN #10003
>




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