Electrical problem

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MyFirstCougar
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Joined: 09 Sep 2017, 19:34

Electrical problem

#1

Post by MyFirstCougar »

I am updating and performing needed repairs and maintenance on my 1967 Cougar - i am the original owner. The headlights, brake lights, and sequential turn signal work but the interior convenient lights and backup lights do not. I have changed bulbs and checked fuses, the problem remains. Any thoughts where the problem may be? I have thought about betting a multimeter to check voltages. My electrical skills are limited so I may need to get the car to a mechanic or the other option would be to bring it in to WCCC, I am only 35 mikes away.

Mike
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Gaugster
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Joined: 17 Apr 2019, 20:58

Re: Electrical problem

#2

Post by Gaugster »

WCCC has a free download of the electrical schematics. I'd have a look at that and see if you can make sense of anything. I'd double check the highlighted fuses. A voltage meter could be very helpful but also confusing based on folks skills. Inspecting various connection points may be helpful. How does your ignition switch work? Rock solid or a little flaky sometimes? Might be a clue...
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John - '68 Cougar XR7 390 FE (X-Code) 6R80 AUTO
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Midlife
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Re: Electrical problem

#3

Post by Midlife »

Backup lights may be due to misadjusted NSS/BU switch or a bad fuse (top horizontal one), shared with radio and sometimes PRNDL lamp.
Interior convenience lamps are trickier on Cougars than Mustangs, particularly on a XR7. Do they come on with the door opening? Headlight knob rotated fully past detent? If not, I'd suspect fuse on lower right, vertical.
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70toy
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Joined: 14 Aug 2021, 15:23

Re: Electrical problem

#4

Post by 70toy »

I have had a glass fuse unsolder itself inside the end cap. It looked fine but didn't conduct electricity. Even getting an inexpensive 12 volt test light can help trace voltage loss issues.
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