1999 Ford Mustang Convertible Dimming - Electrical & Lighting Systems

Question: the passanger side headlight is brighter than the driver side. Why? what can i do to eliminate that because i want both headlights to be be equally lit. i talked to my mechanic and he said the best thing to do would be to buy a new headlight wiring harness. Will that work and how much would that cost. what else can i do to fix the problem? thanks.

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Technican: The most common cause of one headlight being brighter than the other is a poor ground wire connection on the side of the dimmest light. This would call for only improving the groung connection, not replacing the harness. Assuming that the headlights are the same type, color and same manufacturer, it is good business to swap the headlight bulbs positions. Did the problem move to the other side? Yes? Bad bulb. No? Bad ground. There should be a ground wire for each side of the car's front lamps. Usually a black wire bolted to the fender structure or radiator support near the front lamps. Look for a broken wire or a loose bolt. Repair as needed. Need more specifics? I can get a diagrahm and expand my reply if needed.

Owner: that was very good information, however, my mechanic did check for a bad ground connection "only" on the batterry, not by the fender or radiator. he did clean and reconnect the black wire to the batterry. Can you send me a diagram of were i can find the ground for both headlights? Before i installed the new McCulloch 8000k HID upgrade kit, i still had the same problem. the passenger side headlight was dimmer than the driver side. Now, that i have the HID kit, the driver side headlight is very bright compared to the passenger side; you can't even tell that i have a passanger side headlight. its really annoying. thanks

Owner: Oops! i mixed up the headlights in the last reply. the Passenger side headlight is brighter than the driver's side, not the other way around. Sorry.

Technican: Do you have a FAX number I may send a schematic to? Will a cover sheet be needed?

Owner: hi, i do have a fax machine, but you're going to have to call me to notify before you send the fax so i can hook up the fax. However, i did find the ground for both headlights. After i cleaned the screws and ground connections, i reconnected them and still, i had the same problem. What can i do next? i found an inexpensive upgrade headlight wiring harness kit online. Will that completely fix the problem? my cell number to notify me: 1.626.372.0349 And my fax number after you notify me: 1.626.350.3033 thanks!

Technican: First lets have you check: Is Fuse #10 (10 amp) in the central junction box good? Through this fuse power goes to the left headlight connector on the WHT/LT GRN wire. Have you tested the voltage arriving at the left headlight connector on the WHT/LT GRN wire? The ground connection for the left headlight is spliced (S103) into the wiring harness near the breakout to the left front park/turn lamp. You would need to unwrap the wiring until you found it starting from the screw you found that bolts down the black ground wire.

Owner: Well we checked everything possible and we FOUND the problem. THe Problem happened to be the Aftermarket Headlights. I bought some headlights housings of the internet and both the passenger and driver side housings were disaligned. the passenger side was too high and the driver's side too low!!! after about 10 minutes with a screwdriver and re-aligning the headlights, i was able to rid of the problem. NO MORE BRIGHT HEADLIGHT!!!! Thanks OT for your help.... Abraham

Technican: Will you accept my answer? I had no clue that headlight aiming was the problem. Everything I offered was for a light intensity deficiency, not headlight aim. Your mechanic must have missed this also. That is weird. He saw the car... You're welcome,

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