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Hirevtuner's Avatar
 
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Fuse blowing! Power Windows

Hey electrical gods here is my trouble. Working on a 1987 930 slantnose and the #1 fuse keeps poping. This controls the sunroof, power seats and power windows. It's a 1987 so there is a power window control module but the #5 fuse off it is working. Power seats are both working but no sunroof or power windows. If I put a meter on the two points the fuse gos in I get 12.4v and no amps if that helps. As soon as I put a 25amp fuse in it pops. Good mechanically but not the best at electrical if anyone can help.

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1981 411 rwhp, Ruf intercooler, 964 cams, Turbo Kraft injector blocks, Extrude honed intake, 7006 Turbo, Tial wastegate, RarlyL8 exhaust, MSD6al
Old 06-01-2012, 04:38 PM
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My guess... The wires on the drivers side power window switch are connected incorrectly.
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Old 06-01-2012, 09:25 PM
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Quote:
Originally Posted by unclebilly View Post
My guess... The wires on the drivers side power window switch are connected incorrectly.
I changed nothing and everything was working perfect till one morning!
I also disconected that harness and same thing so it's not that.
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1981 411 rwhp, Ruf intercooler, 964 cams, Turbo Kraft injector blocks, Extrude honed intake, 7006 Turbo, Tial wastegate, RarlyL8 exhaust, MSD6al

Last edited by Hirevtuner; 06-02-2012 at 02:06 AM..
Old 06-01-2012, 09:50 PM
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Turbofrog
 
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You need to check the wiring from the relay to the switches. They are old and probably have a short now.
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Old 06-02-2012, 01:06 AM
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Having trouble figuring which relay this is. Anyone know or have a picture?
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1981 411 rwhp, Ruf intercooler, 964 cams, Turbo Kraft injector blocks, Extrude honed intake, 7006 Turbo, Tial wastegate, RarlyL8 exhaust, MSD6al
Old 06-02-2012, 02:08 AM
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I wasn't sure if in 87 they had the block connector on the window switches or a bunch of spade connectors. My 77 had this same problem when I bought it and it was improperly installed spade connectors.

The relays are labeled in your fuse block.
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86 930 Slantnose - featured in Mar-Apr 2016 Classic Porsche
Yoosta have: 90 C4 Targa, 87 944, 73 911 ChumpCar endurance racer - featured in May-June & July-Aug 2016 Classic Porsche
Old 06-02-2012, 05:37 AM
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Quote:
Originally Posted by Hirevtuner View Post
I changed nothing and everything was working perfect till one morning!
Hard to follow between the 2 thread but...

From 35 years of Fault Finding, 95% of the time there is something that change but goes unnoticed... Until the problem is found and the relation make sense.

Where was the car left last night? If outside, did it rain?
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Old 06-02-2012, 05:07 PM
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ok got it fixed.
ended up being a faulty window switch and the spare that I switched out was also faulty. After testing it with a meter I used my back up back up spare. lol

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1981 411 rwhp, Ruf intercooler, 964 cams, Turbo Kraft injector blocks, Extrude honed intake, 7006 Turbo, Tial wastegate, RarlyL8 exhaust, MSD6al
Old 06-02-2012, 07:15 PM
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