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bush0117 · Posted: Thu Oct 07, 2004 7:11 am Post subject: Short

I think I fixed my short in my car. I unhocked the clock and it went away. But after that I notice that the wires on the headlight switch are melted together. Does anyone know want might have cause this? Should I just repair the wires? And does anyone know where I can get a new fuse box and relay board at? And one more thing how about a under dash wiring harness? Sorry for all the questions.

Jason Bush

Lizard · Posted: Thu Oct 07, 2004 11:17 am Post subject:

replace all melted wires.

as far as a new dash harness, not worth the money Porsche wants.
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3 928s,

D Hook · Joined: 02 Nov 2002 Posts: 3158 Location: Omaha, NE

Ebay has a wiring harness. Mikri (on this board) may also. Same for the fuse panel. Consider removing the entire dash if doing a rewire job.

What was the original problem?

bush0117 · Posted: Sat Oct 09, 2004 1:48 pm Post subject:

The first problem with the car was after about 2 days of sitting. The battery was dead. Started looking for the cause and came across seeing that the heater motor was bad. Started taking out dash. And after unhooking the clock the postive short seem to go away. But after getting the dash out I see that the headlight wires on the back of the switch are melted together. So thats why I posted the main questions. Just to see if anyone here might know want cause that. And the reason I thought about changing the fuse box and realy box. Is cause the car sunroof leak for a long time and theres alot of water damage in the car. With maybe everyones help here and alot TLC this wenther I have her back on the road by spring. Thanks for the help.

Jason Bush

kye · Posted: Mon Oct 11, 2004 1:27 pm Post subject:

when fault finding (something I have a lot of experience with, mainly in IT) you have to make sure that you're noticing the resultant changes from single and isolated changes.
from your message i'm assuming that you didn't verify everything else before and after you disconnected the clock, which means you should attribute those effects to that action.
when things are complicated, try writing down what you did at each point, and what you observed. that way you'll be able to go back and look at your notes when trying to work out something complicated, especially if more than one thing is contributing to the effects. worst case is you use a sheet of paper and slightly more time doing things, best case is that it enables you to work out what's going on.

a careful logical approach is always best when fault finding

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Sleykin · Posted: Tue Oct 12, 2004 1:39 am Post subject:

Was the clock working? It is supposed to draw a small current all the time but it should be able to sit for weeks without draining the battery if the battery is good. How did you determine you actually had a short? You can't tell with a voltmeter. You need an ampmeter or test light to verify it is a short that isn't supposed to be there. The domelight in the hatch is a common battery killer. The switch on the strut has a habit of staying on sometimes and that will drain the battery in 2 days easily.
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Glenn Neff
Medford, OR
87' 924S