How to repair the Mercury Grand Marquis Light Control Module.
The light control module on many Mercury and Ford vehicles are soldered rather poorly. The relays solder joint becomes cracked. Therefore the headlights and other light units controlled by this module function poorly. They may work sometimes and just stop at other times. It is rather easy to repair. Just need to solder the relay modules as shown. Please see all pictures.
You will need a 7mm socket to remove the 3 hold down bolts and a T15 for the two on top.
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