Headlight troubles
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Senior User
Joined: Nov 2008
Posts: 460
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From: Gifford, IL
Headlight troubles
Hey guys, my friends got a 92 bronco and is having headlight issues. The drivers side bulb was burned out, he had it replaced when getting his oil changed but it blew within moments. I looked at it the other day, and the headlight itself has a good amount of moisture in it. Pulled the bulb out and swapped a new one in (left it outside of the headlight housing) and within seconds it was smoking so we shut it off. Seems like its getting too much power and getting fried? Anyone know what to do?
Lead Driver
Joined: Sep 2002
Posts: 9,182
Likes: 12
From: Gateway to the West
Pull the headlamp from the socket and put a meter on the terminals in the socket. It can't be getting any more power than the battery itself is putting out. I'm betting on a short in the socket itself probably causing both high and low beam filaments to get power at the same time. Its not the electricity causing the lamp to fail... its the overheating of the lamp with both filaments energized.
The Southernmost Mod
Joined: Dec 2004
Posts: 6,902
Likes: 20
From: Caracas, Venezuela
I had that issue, but usually it was my low beam (of course, as it was the one used the most). I'm pretty sure it was moisture in my case, and not a short. I swapped new headlight housings (they actually had everything, including new Sylvania bulbs) and it was the end of it.
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Senior User
Joined: Nov 2008
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From: Gifford, IL
What kind of readings should I look for in the socket? Just see if its getting more amps than the other socket? How do I remove the headlight? Ive got the old ones from my F-250 that will fit, but its been 2 years since I removed mine and the only thing I remember is that it was a PITA to remove it
Lead Driver
Joined: Sep 2002
Posts: 9,182
Likes: 12
From: Gateway to the West
You won't get an amperage reading with the headlamp not in the socket. Voltage, however, should be same as the voltage at the battery when taking a reading across the BLACK and RED/BLACK wires with the headlamp switch in the low-beam position. It should be the same across the BLACK and LT. GREEN/BLACK wires when the switch is in the high-beam position. However, you should have voltage at EITHER the red/black wire OR the lt. green/black wire depending upon which headlamp filament is selected. NEVER should you have voltage at both of these wires.
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