Question about 1996 Mercury Cougar XR7

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I submitted a question concerning the headlights going on and off while driving and discovered it will do the same thing parked in the driveway running. I also discovered that the lights don't start malfunctioning until the car warms up or runs for a couple of minutes. I made sure to notice whether the fan kicks on and did not seem to coincide with the malfunction. what do you think?

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It sound like a wiring problem. But to be truly sure, measure the voltage across the battery when you have the lights on and the engine off and do the same when you have the lights on and the engine running to see that the alternator is charging the battery and that your battery is in good shape. I would advise next to check the sockets of the lights if they are secure and that there are no damages. Inspect the relay of the lights if they are connected properly. The heat may impact the relay as internally the relay has switches and heat may cause it to expand. Other than that I would advise to inspect the wiring harness for loose connections or bad terminal. Heat has an effect on the conductors of the wires.

Posted on Oct 07, 2009


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