headlight problem

Mstng93SSP

You have a nice rear end there Dave.

15 Year Member

Nov 29, 1999

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Mililani, Hawaii

Oct 20, 2011

#1

• Oct 20, 2011

• #1

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

5 Year Member

Apr 10, 2011

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Maryville, Tenn

Oct 20, 2011

#2

• Oct 20, 2011

• #2

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

5 Year Member

Apr 10, 2011

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Maryville, Tenn

Oct 20, 2011

#3

• Oct 20, 2011

• #3

multiple post

 

Boydster

5 Year Member

Apr 10, 2011

301

20

39

Maryville, Tenn

Oct 20, 2011

#4

• Oct 20, 2011

• #4

multiple post

 

Mstng93SSP

You have a nice rear end there Dave.

15 Year Member

Nov 29, 1999

2,993

3,500

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Mililani, Hawaii

Oct 20, 2011

#5

• Oct 20, 2011

• #5

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

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

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Oct 21, 2011

#6

• Oct 21, 2011

• #6

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].

 

B

Blackbetty88gt

Member

Feb 14, 2011

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2

11

Oct 21, 2011

#7

• Oct 21, 2011

• #7

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

 

FoMoCo17

Member

Apr 1, 2011

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Oct 22, 2011

#8

• Oct 22, 2011

• #8

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

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

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Oct 22, 2011

#9

• Oct 22, 2011

• #9

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

 

Mstng93SSP

You have a nice rear end there Dave.

15 Year Member

Nov 29, 1999

2,993

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Mililani, Hawaii

Nov 5, 2011

#10

• Nov 5, 2011

• #10

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

Chris