Bad headlight switch?

[Black_69_FB 49]

Got the gauge cluster back in after installing new LEDs & printed circuit. All gauges work! Instrument lights are MUCH brighter with the LEDs :)

 

However, the dash lights go out when I pull the headlights on. Works fine with the parking lamps only, although I do have to wiggle the knob a bit sometimes to get them working. Any idea what it could be if not the switch?

[jag 10]

That may not be the entire problem but it sounds like the wiper that rubs the rheostat is worn and moving it makes it touch the rheostat completing the circuit momentarily. If it is an original switch replace it and eliminate it as a possibility. 40 years is longenough for a switch.

JAG

[Black_69_FB 49]

I pulled the switch last night. Took the rheostat out, cleaned all the contact points, reassembled with a little dielectric grease. Reinstalled it, no change. So I ordered a new switch. Amazon.com had Motorcraft brand for less than $30.

[Black_69_FB 49]

Got the new switch in last night. Problem solved :biggrin:

[rangerdoc 22]

I never thought to look at Amazon for parts.

[Black_69_FB 49]

I never thought to look at Amazon for parts.

 

I just googled the part # and followed the bread crumbs...

 

It was a Motorcraft switch. Or at least it came in a Motorcraft box :-)

[Max Power 74]

I just googled the part # and followed the bread crumbs...

 

It was a Motorcraft switch. Or at least it came in a Motorcraft box :-)

 

The ones from CJPony and the like come in a Motorcraft box too. Sounds like your dash lights were tripping into the courtesy circuit.