99 F-150 no headlights
#1
99 F-150 no headlights
I have a 99 F150, with the 4.6, and my headlights just randomly quit. I checked all the fuses, and switched the MFS, and main headlight switch. All I have is my DRL's. I also checked for wires coming out of the plug-in on the column, but they seem good too. I'm just not sure where to go from here, any help would be greatly appreciated.
#2
You'll need to use a voltmeter to actually measure (and report results).
Equipped with Autolamps or not?
Do ANY of the headlights work in any mode (high, low, flash-to-pass)?
Do the parking lamps work when the headlights are turned on?
Fuse F3 (under hood), F16, F26, and F28 (under dash) all okay?
Equipped with Autolamps or not?
Do ANY of the headlights work in any mode (high, low, flash-to-pass)?
Do the parking lamps work when the headlights are turned on?
Fuse F3 (under hood), F16, F26, and F28 (under dash) all okay?
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#5
So, I checked for power at F3 and there was 11.9 on dims and 9.5 on brights, not sure why there is this deviation. Also, when I drove the truck after work today, the theft light started blinking rapidly for around 10 minutes and then quit. Not sure if this and the headlights not working are related, but it kind of points towards the steering column wiring?
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#8
Go back to F3 circuit. You should have full battery voltage on both sides of the fuse whether the headlights are switched on or of, low or high. Which side of the fuse did you measure, the supply or the load side?
What is the battery voltage when the engine is running?
Make certain that you are making ALL of your measurements with the negative lead of the meter connected to a good vehicle ground. Your reading is the previous post suggests a problem in the supply circuit or in the measurement technique. I'd suggest posting your actual readings rather than your interpretation of them.
What is the battery voltage when the engine is running?
Make certain that you are making ALL of your measurements with the negative lead of the meter connected to a good vehicle ground. Your reading is the previous post suggests a problem in the supply circuit or in the measurement technique. I'd suggest posting your actual readings rather than your interpretation of them.
#9
Ok, so I tested the F3 circuit again, this time with the truck running. It measured 14.1 on the supply side 2.95 and the load side. I'm not understanding why there is power on both sides to begin with. If you could elaborate a little more on that, to give me a little more knowledge, that would be greatly appreciated.
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