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Old 03-06-2004, 21:33   #1 (permalink)
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Strange Electrical problem

This one has got me stumped

When I open the left hand door whiile the car is idling and the a/c is on high, the stereo turns itself off momentarily and then resumes where it was. Checked all the wiring to the door and nothing tests as having been broken

It looks like the current draw of interior lights ( two underdash and two in the doors ) is enough to drop the voltage low enough to trip the stereo

Only running an early internally regulated 55amp alternator

Thanks
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Old 03-06-2004, 22:04   #2 (permalink)
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Re: Strange Electrical problem

Which car? Originally Left hand drive or right hand drive?
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Old 03-06-2004, 23:54   #3 (permalink)
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Re: Strange Electrical problem

Sounds like a short of some kind.
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Old 03-07-2004, 04:04   #4 (permalink)
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Re: Strange Electrical problem

Problem is in the RHD 69 Cougar Convertible which has door speakers and Sony Xplod CD

Thought it was a short - but it is only the CD player that is affected.

Have pulled the speaker wiring and it is ok. Only happens with left door, when the car is idling and the a/c is on or if a/c has been running for on full output for a while (only done this once). A/C is run off a relay. Will happen when the door is first opened and then won't repeat.
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Old 03-07-2004, 04:09   #5 (permalink)
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Re: Strange Electrical problem

Where is your power coming from?
Might sound silly but have you checked the relay you mentioned?
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Old 03-07-2004, 15:08   #6 (permalink)
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Re: Strange Electrical problem

Well it certainly gets the weird problem of the day award !

As a thought, have you tried opening the left door with the courtesy lights already on ? (i.e. another door already open).

Or perhaps more interestingly, leave the left door open, tape down the open door switch (i.e. convince the car that it is closed), do what you do (idle, a/c, cd etc etc), and whip off the tape. This should at least isolate whether it is related to physical movement (i.e. crimped cable) or purely electrical gremlin....
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Old 03-08-2004, 03:18   #7 (permalink)
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Re: Strange Electrical problem

Quote:
Originally Posted by TIKFD6
Might sound silly but have you checked the relay you mentioned?....
.... sounds like a good idea. I think the relay is fed from main power top supply. I might upgrade it anyway to a 40amp Ford relay from plain old Narva

Quote:
Originally Posted by XR8 Lamah
As a thought, have you tried opening the left door with the courtesy lights already on ? (i.e. another door already open).....
.... Yep tried that one and there is no change (CD still drops out) but it doesn't happen if I turn lights on with the dash switch

Quote:
Originally Posted by XR8 Lamah
Or perhaps more interestingly, leave the left door open, tape down the open door switch (i.e. convince the car that it is closed), do what you do (idle, a/c, cd etc etc), and whip off the tape. This should at least isolate whether it is related to physical movement (i.e. crimped cable) or purely electrical gremlin.....
.... I'll give that a shot on weekend. starting to sound like a problem with a bad earth on the door switch - but why would it impact the CD player?
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Last edited by leonbray; 03-08-2004 at 03:21.
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