windows blow fuse every few days

[justinbaldwin]

happy new year

i can't stand it any more, so today i am finally addressing my faulty window problem. my windows have packed up completely. originally they blew their fuse every few days, or sometimes immediately. not being an electrician i guessed i had a loose connection. i searched for it and fiddled with the connections but was unable to source the problem.

i did increase the rating of hte fuse, which worked for a while until the relay blew! but i don't know if the relay was already faulty and the cause of the original problem, or whether i just blew it with the increase amp fuse. i have replaced the relay and put back the proper amperage fuse and they worked for a day, then they stopped altogether, without blowing the fuse. (no smell of any burning) now i can't even get a current reading on any of the wires in any of the three window switches or at the fuse.

it seems to me that a wire has come loose or broken or burnt somewhere between the fuse box and the switches. any ideas?

i don't want to do anything else until i get some more technical thoughts about what might be going wrong, and how i might trace it.

does anyone have any clues, tips, ideas, thoughts, stories that might help me sort this out.

not much more i can say, except that the alarm isn't wired into the windows, i haven't changed anything, and they used to work perfectly until now.

very many thanks for all your help, past present and future.

i hope 2005 is porschetastic for you all

regards

justin

[Max Von]

Justin,

Check the wiring harness between the door and the body. Sometimes the harness insulation wears thin and will cause the wires to come in contact with the body when you open the door to it's full open position. The leading edge (front) of the door will pinch the harness against the body. This will cause the fuse to blow. It's difficult to inspect as there is very little room to work in that area. Good luck.
Max

[bell]

is there the possibility of water getting in the door and getting the motor wet? i've seen it happen on non-p-cars......
if it ends up just being a tired window motor you could use auto-reseting cirquit breakers in place of the fuse, i wouldn't do this until you confirm the problem though as if there is an actual short it could burn the wires worse.

i would pull the door panel, and use a multimeter or test light to see if the signal is getting to the motor or if you are losing power to the switch, also mark your wires on the switch as they can be easily confused.

[unclebilly]

It's probably what Max said.

[BigEquity]

I had the same problem with my '77 911. I found out that if I opened the doors before I put up the windows that the fuse would not blow.... I unfortunately never figured out a real solution to the problem.

[Wil Ferch]

Don't EVER increase the fuse size.....I don't need to tell you why....

Find the problem....

It could also be increased friction and resistance of the window mechanism...see if you can the door panels apart and clean/lube the mechanism as well as clean/lube the window channels....

Wil

[Paulporsche]

Justin,

I had my windows blow the fuses last summer. When I traced the wires I found they were not continuous. There were connections inside the door. One of these had come loose and was either contacting the door or another wire. The connection I am referring to was about 6" back from the switch so when I pulled the switch out from the door panel it was exposed. I didn't have to remove the panel.