headlight problem

[Mstng93SSP]

1993, LX Coupe, mostly stock. If I have my lights on, after about 8 to 10 minutes the headlights turn off, but only the headlights? All the other lights (Tail, side marker/parking lights) are still on? If I pull back on the turn signal to "flash" the high beams, the headlights come on high beam. Anyone know where I should start to troubleshoot this? Switch? relay?

Thanks,

Chris

 

[Boydster]

Go for the headlight switch and connector. My 87 did that for a while, flashing the high beams sometimes brought the headlights back. The connector and the outer case of the headlight switch were melting...

 

[Boydster]

multiple post

 

[Boydster]

multiple post

 

[Mstng93SSP]

I wired in a new connectror as I thought that was the problem. I think it's the switch. I have a friend with a 93 and I will try his switch. Hopefully that is the problem.

Thanks

Chris

 

[HISSIN50]

There's a thermal switch inside the headlight switch. The load from the headlights causes the switch to open the circuit if the thermal switch is weak or the headlights are drawing too much current. Do the headlights come back on after a little while?

Flash-to-pass functions because it circumvents the headlight switch [as the power source].

 

[Blackbetty88gt]

well if that does not fix it. then it is your multifunction switch. That is how mine acted and what fixed the problem

 

[FoMoCo17]

Corral.net or something like that has a great write-up on doing the conversion for wiring in a relay to the existing healight wiring system. This is a known problem on the Mustangs ... Ford undersized the wires one size to small on the headlamp power circuit causing this thermal limiter to kick the headlights out until the circuit cools off ... can be a real problem while driving at night. Turn off your foglights at night, and it probably will not do it. If it continues to do it w/o foglights on, the turn signal/high beam switch assembly probably needs to be replaced. Then perform the conversion as stated above to keep healight wiring system and wires cool.

 

[HISSIN50]

He has an LX, which as I recall, do not have fog lights.

 

[Mstng93SSP]

It was the headlight switch. Put in a new one and the problem is fixed. Thanks for the replies.

Chris