'93 Grand Marquis light switch problem

Asked by Geezak007 Feb 20, 2020 at 11:46 AM about the 1993 Mercury Grand Marquis LS Sedan RWD

Question type: Maintenance & Repair

I replaced the light switch and power plug, now with the key off, the clock, radio
and shift indicator stay on and drain the battery.  I've checked all the wires and
they are all in the right places.  These lights work when you use the dimmer on
them which makes it seem to me all the wires are in the right place, but why
would only these 3 items stay lit?  Anyone out there got any ideas?

1 Answer


If you replaced a module or connector, check the pins on the new item with a meter, they may not make the same connection as the old one. Also most electrical items on a car switch on the negative side of the circuit (meaning power is always applied, and a connection on the negative side completes the circuit), so an errant ground could cause power to be applied to that item. Without knowing exactly what you did and what the pin outs on the replacement item are it's impossible to make a suggestion to you, other than to review the circuit in question, and don't trust any replacement circuit item to be exactly the same as a new one. They love making year by year changes to wire harnesses, connectors, and modules.

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