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Question
headlights go on and off at tines while driving. headlights are stock voltage. turning lights off with headlight switch has no a fect. happens on both low and high beams 1990 mercury couger ls
Hi Lawrence!
The problem is likely either in the headlight switch or a short in the wiring. You could try a 'wiggle test' all along the wiring harness and see if there's any change. Otherwise, you'll have to use a voltmeter and 'trace' the entire headlight circuit.
-----Aaron
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Answers by Expert:
A. Rowe
Expertise
I can usually answer how to fix automotive problems or at least how to troubleshoot the problem on most cars and trucks. I specialize in mechanical and electrical work, but do occasional paint/body/fabrication work. I'm from the U.S., so, I might not be able to answer specific questions from 'non-North American available' vehicles.
Experience
I am an ASE certified master automotive technician for 15 years with a degree in automotive technics and business management. For the last 20+ years I've worked on just about everything with an engine or wheels. I have owned and operated an automotive repair business since 1993. I can also help with information about Pa. state inspection and the Pa. vehicle code.
Organizations
Formerly held a NASCAR license and built/maintained race cars.
Education/Credentials
Degree in Automotive techics and business management, as well as ASE certified master technician, PA state inspection license, completed trainings from Bendix, Bear, Moog, PDQ and countless others.
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