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How do you check for power at the bulb socket? What are the steps? Thank you!How do you check for power at the bulb socket? What are the steps? Thank you!
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Dimmer switch more then likely (hi ,low switch) , but testing B+ voltage in and out for low beams > Find a wiring diagram at http://www.bbbind.com/free_tsb.html Get a DVOM - digital volt ohm meter , Back probe the correct wires , red with black stripe at the dimmer switch , in the low beam position and headlamps switch on , is there B+ voltage ? There are videos on youtube for basic automotive electrical testing . Maybe you should take it to a qualified repair shop .
is the light setup one ballast for high and low beam ? if so the ballast has gone, probably even the bulbs. replace the ballast and bulbs. some aftermarket ballasts don't last, if you cannot find the right ballast for replacement you will need to replace both ballasts. as every ballast set are set the same and sold in pairs.
Both your low beam and your high beam is protected by the same fuse, so it makes sense that the fuse is OK if the high beam is working on the passenger side. There are 3 fuses for the headlamps. Fuse #13 in the Battery Junction Box (20 Amp). If this fuse is blown, the headlamp relay will not have any power and neither high nor low beam on either side will work (you will have no headlamps at all) Then there is Fuses #2 and #3 (15 Amp) in the Battery Junction Box. #2 goes to the left low and high beam and #3 goes to the right low and high beam.
The headlamp switch uses a SINGLE CIRCUIT to control BOTH sides at the same time, so if one side works, the switch cannot be the problem. The headlamp relay provides power for fuses #2 and #3 and we alreadyascertained that these fuses must have power since we have working lights on both sides, so the relay cannot be the problem. A replacement bulb has already been tried, so that pretty much leaves us with a bad lamp socket. (Most likely cause) or a bad connection at splice #S122, which is located in the main wiring harness near the breakout for the left headlamp. (RED/BLACK wire)
did you check for a relay in your fuse panel? there should be a relay that controls your low beams and one for your high beams. check for that and then if high beams are working swap it with low beam relay. if your problem switches to low beams working and high beams not working replace the bad relay.
The low beam and high beam are seperate, one can blow and the other will work, you need to replace the low beam bulb only, any auto parts store will have this bulb
Daytime Running Lamps
The daytime running lamp (DRL) system is designed to turn the high beam headlamps on, with a reduced light output, and without illuminating the high beam indicator lamp in the instrument panel. You have a DRL Module.
The multifunction switch is the stalk on your column.
This is 96 F150 circuit. Don't have 94.
Symptom Chart, Headlamps
HEADLAMPS
Condition
Possible Source
Action
Headlamps Inoperative
Circuitry open/shorted.
Damaged headlamp switch.
Blown fuse.
GO to Pinpoint Test A .
Headlamps On Continuously
Circuitry open/shorted.
Damaged headlamp switch.
GO to Pinpoint Test B .
High Beams or Low Beams Inoperative
Circuitry open/shorted.
Damaged multi-function switch.
GO to Pinpoint Test C .
One High Beam or One Low Beam Headlamp Inoperative
The Head Lamps for the "Low Beams" are tricky but they work just like the High Beams do. You have to reach around the Headlamp assy (toward the Outside of the car) and locate what feels like the same type of bulb holder as the High Beams. Twist it counterclockwise and it should remove by pulling toward the back of the car. Putting back in the new bulb is even trickier in that you can't see the hole it needs to go in. You will have visualize the headlamp location on the outside of the car and position your hand on the inside. it takes several tries but it works. Twist it back in clockwise. Careful with the Halogen bulbs though. Use a Paper Towel piece or small rag to hold it if needed.
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