2003 Mustang Headlights dont work, but all others do. Help please! - Ford Mustang Forum
 
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post #1 of 5 (permalink) Old 12-11-2010 Thread Starter
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2003 Mustang Headlights dont work, but all others do. Help please!

I just finished swapping out my Medium Graphite interior for a GT's Midnight Black colored interior and now I have 2 odd problems: 1, the headlights dont work when I pull out the switch, nor do the high beams come on when pulled back to 'flash', but all my other lights work(brakes, turn signals, interior, cluster lights) and 2, I noticed the electric cooling fan was running when the car was off. Im completely clueless on whats going on here, did I plug in a connector wrong? Maybe a prong came loose while doing the swap? :?:
I have races coming up soon and I cant enter if my lights dont work! DX Any help would be very much appreciated...

Edit: Fuse panel under steering wheel checked and the fuses look good. Headlight bulbs are both good. Headlight grounds both check out fine. Dont know what else to do... :?: I


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post #2 of 5 (permalink) Old 12-11-2010
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Confirm fuse F1.2, F2.38, F2.10, F2.4. Pay special attention to fuse F1.2 in the engine bay.

If no fuse problem found, confirm if +12 volts are present at the headlight DB/OG wire (switch off). Next turn the headlights on and test for +12 volts on the DB/OG and RD/YE wire. Post.

If no power at the headlight switch, check connector C134 located in the left hand fender well. Will be necessary to pull the fender liner to gain access.

If power on the headlight RD/YE wire, the problem is in the multi-function switch. Start with a double check of the connectors to/from the steering column.

As for the fan running, double check the connector to the PCM. Look for bent/pushed/dirty pins.


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post #3 of 5 (permalink) Old 12-11-2010 Thread Starter
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Quote:
Originally Posted by wmburns View Post
Confirm fuse F1.2, F2.38, F2.10, F2.4. Pay special attention to fuse F1.2 in the engine bay.

If no fuse problem found, confirm if +12 volts are present at the headlight DB/OG wire (switch off). Next turn the headlights on and test for +12 volts on the DB/OG and RD/YE wire. Post.

If no power at the headlight switch, check connector C134 located in the left hand fender well. Will be necessary to pull the fender liner to gain access.

If power on the headlight RD/YE wire, the problem is in the multi-function switch. Start with a double check of the connectors to/from the steering column.

As for the fan running, double check the connector to the PCM. Look for bent/pushed/dirty pins.
Fuses check out ok. A little colored on the pins, but functional. Replacing them just in case...

How can I check for volts in the wires? Not an electrical person, Im new to this...

2004 Mach1 5spd - His 13.6 @ 105
2004 V6 Auto - Hers
2013 Taurus SEL - The Bull
2000 SSEi - Blown Sleeper
1995 Probe GT - It Was Free!
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post #4 of 5 (permalink) Old 12-11-2010
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Quote:
Originally Posted by SVT232V6 View Post
How can I check for volts in the wires? Not an electrical person, Im new to this...
Check...Check...Testing 1,2,3. Testing 1,2,3.

Just making sure we are in the Tech section.

Do you have a Volt-Ohm meter? If not, not much more we can do. Eject.

If asked to test the voltage on a car battery, how would you do it? Set the VOM to DC scale and touch the red lead to the positive terminal. Touch the black lead to the negative terminal. Read the voltage.

So... do the same with the headlight switch terminals.

If that still doesn't do it for you, perhaps consider a professional.

2003 GT Convertible (sold & missed)
2000 GT coupe (Craigslist project. Fixed. Now my DD). Windsor to Romeo swap.
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post #5 of 5 (permalink) Old 12-19-2010 Thread Starter
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Quote:
Originally Posted by wmburns View Post
Check...Check...Testing 1,2,3. Testing 1,2,3.

Just making sure we are in the Tech section.

Do you have a Volt-Ohm meter? If not, not much more we can do. Eject.

If asked to test the voltage on a car battery, how would you do it? Set the VOM to DC scale and touch the red lead to the positive terminal. Touch the black lead to the negative terminal. Read the voltage.

So... do the same with the headlight switch terminals.

If that still doesn't do it for you, perhaps consider a professional.
I retraced all the wiring I touched during dash swaps, there was a connector that wasnt properly secure somewhere behind the steering wheel... But thanks for your help WMBurns, I will save this thread for future reference... You know your stuff! I wish I knew electrical systems well... My old 85 Corvette has wiring harnesses with burnt wires and just about every nightmare possible lol...

2004 Mach1 5spd - His 13.6 @ 105
2004 V6 Auto - Hers
2013 Taurus SEL - The Bull
2000 SSEi - Blown Sleeper
1995 Probe GT - It Was Free!
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