92 gt,horns on with headlights and no markers,HELP!!! - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 6 Old 05-12-2011, 06:11 PM Thread Starter
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92 gt,horns on with headlights and no markers,HELP!!!

Here's the story.I'm doing work on a 92 gt this kid bought as a roller.car had no engine bay wiring.got a 93 cobra engine harness,put it all in,car runs and everything and I put the headlightharness from his 90 in it.problem I'm having is when the headlights are turned on the horn goes off and the side markers don't light up.the inners light up for the hazards but that's it.any ideas???


96gt coupe-KB,bore'd,stroke'd,cam'd & blown. pretty much nothing untouched
96gt vert- full exhaust,pi swapped bolt ons and little things DD-SOLD
2005 GSXR 1000- 2 brothers exhaust and k&n
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post #2 of 6 Old 05-13-2011, 07:51 AM
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Originally Posted by blckstng96 View Post
Here's the story.I'm doing work on a 92 gt this kid bought as a roller.car had no engine bay wiring.got a 93 cobra engine harness,put it all in,car runs and everything and I put the headlightharness from his 90 in it.problem I'm having is when the headlights are turned on the horn goes off and the side markers don't light up.the inners light up for the hazards but that's it.any ideas???
Well, just looking at my 1990 wiring diagram book the headlights and horns share one common connector (C108) located near the starter solenoid and fusible links in front of the left strut tower. Check the wire color at the headlamp connectors and compare them to the wires at C108. A multimeter would be helpful as well to determine the right wires. My wiring diagram shows a LG/BK and R/BK wires going to the headlamps. It appears the horn should only have one wire which is DB (dark blue)?


1990GT- New suspension, 5 lug Cobra disk brakes, King
Cobra clutch, FRPP 7003Z T5, aluminum drive
shaft and 3:55 gear. Daily driver with 200K plus
miles.
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post #3 of 6 Old 05-13-2011, 10:45 AM Thread Starter
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Idk what c108 means lol.yes,horns are a single blue wire.

96gt coupe-KB,bore'd,stroke'd,cam'd & blown. pretty much nothing untouched
96gt vert- full exhaust,pi swapped bolt ons and little things DD-SOLD
2005 GSXR 1000- 2 brothers exhaust and k&n
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post #4 of 6 Old 05-13-2011, 03:46 PM
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Well, just looking at my 1990 wiring diagram book the headlights and horns share one common connector (C108) located near the starter solenoid and fusible links in front of the left strut tower. Check the wire color at the headlamp connectors and compare them to the wires at C108. A multimeter would be helpful as well to determine the right wires. My wiring diagram shows a LG/BK and R/BK wires going to the headlamps. It appears the horn should only have one wire which is DB (dark blue)?

Where did you get your book from?
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post #5 of 6 Old 05-13-2011, 04:23 PM
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Idk what c108 means lol.yes,horns are a single blue wire.
The C108 refers to the connector number. The headlamps and horns are in the same wiring harness. Trying following the wires back to a connector. The wiring harness from the headlamps and horns should lead you to that C108 connector (the actual connector will not be labeled) and look to see if the wire colors are the same at the plug and receptacle.

1990GT- New suspension, 5 lug Cobra disk brakes, King
Cobra clutch, FRPP 7003Z T5, aluminum drive
shaft and 3:55 gear. Daily driver with 200K plus
miles.
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post #6 of 6 Old 05-13-2011, 04:38 PM
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Where did you get your book from?
I believe I bought the book from Ebay a few years ago.

Here is a set of factory manuals.
1990 Ford Mustang GT Cobra Service Specs Wiring Manual | eBay

Here is the manual by itself for a good price.
Nice Used book 1990 Mustang Electrical/Vacuum Manual | eBay

1990GT- New suspension, 5 lug Cobra disk brakes, King
Cobra clutch, FRPP 7003Z T5, aluminum drive
shaft and 3:55 gear. Daily driver with 200K plus
miles.
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