Intermittent Headlights October 11, 2010, 02:54:50 PM My 91 Cougar LS's headlights will shut off and back on Intermittently. I have already replaced the headlight switch and checked the fuses. Any ideas? Thanks Quote Selected
Intermittent Headlights Reply #1 – October 11, 2010, 04:10:25 PM You may check the connectors that the bulb bases plug into, they may have corrosion or dirt in them. Are there any other electrical anomalies? Quote Selected
Intermittent Headlights Reply #2 – October 11, 2010, 04:17:16 PM Mine did that.Come to find out the harness grounds weren't doing their job. I stripped the metal down,reconnected the grounds to the core support,painted over them....good lights. Quote Selected
Intermittent Headlights Reply #3 – October 12, 2010, 01:12:27 AM Did you check to see if it is wired to the intermittant wiper control? LOL! Seriously though I have more ideas what to check. Check what others have said here, especially grounds. Try Vinnie's advice first. As vehciles get older they tend to have a lot of grounding problems due to corrosion. If it is both LH and RH flickering then it's not a bad idea to check out the hi-beam relay to make sure that is working properly. Along with that check out the dimmer switch because it functions to direct current between the hi and low beam wiring to the high beam relay. The contacts in the switch can certainly wear out or corrode over time. In this case it's possible worn contacts are barely touching and react thermally to heat causing a loss of contact. I am assuming you are using standard halogen bulbs with the factory wattage. Higher wattage aftermarket bulbs might overheat the headlamp switch causing the circuit braker to thermally shut down until it cools off. Also, old corroded wiring or poor connections create resistance which causes overheating of the circuit. Tried to cover all bases. I hope this helps! Quote Selected
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