98 Grand Marquis - no headlights. I've replaced the LCM with a 'Cardone' refurb and installed a new light switch. All lights EXCEPT HEADLIGHTS work. What now?
This is the classic Ford "Panther" platform problem. I'm beyond the 15 year
recall limit.
I don't know what testing you have done? There are four fuses and a circuit breaker that supply voltage to lcm. Use a test light and check voltage on those circuits. Some are hot all the time, some go hot with the key on. The ground for lcm is black, check that also.
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As a followup. Took the car to a reputable shop and the trouble was neither the light switch nor the LCM but a faulty Multi Function Column Controller. Headlights work fine now.
