Re: Lamp problem on 89 Mercury Grand Marquis, HELP!!
Problem sorted, turned out to be the headlamp dip switch on the steering colum. The Contacts in the switch were burnt up an the connection plug had melted on the switchable beam circuit terminal! Replaced the dip switch and the terminals now it's working! Cheers for the help, otherwise i would have been chasing the usual lamp switch.
1980 Chevy Caprice Classic
1983 Chevy Caprice Station Wagon
1989 Mercury Grand Marquis LS