Dome light.
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Elder User
Joined: May 2002
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Dome light.
Hey everybody.
Todays test is why would replaceing the dome lightbulb & fuse kill the turn signals, now the brake lights have a short as well. We have a 99 f-150 plane jane two wheel drive 4.6 pick up. It started with the burned out lightbulb and fuse. The truck drove away fixed everything working. 3mins later it was back with no turn signals. Next the brake lights have a dead short. The trailer plug was cut and pushed into the bumper. Removed the plug, and still have the problems. Disconnected the rear lights from the harness, removed the cab mount brake light, disconected the shift lock solinoid, unpluged the multifunction switch, removed the headlight switch, took the brake light switch off the pedel. When you press the brake light switch the fuse for the brake lights pops. fuse 13 pops as soon as you put it in also. The 4way flashers seem to work as they should.
Thank for any ideas.
Dave Powell
Todays test is why would replaceing the dome lightbulb & fuse kill the turn signals, now the brake lights have a short as well. We have a 99 f-150 plane jane two wheel drive 4.6 pick up. It started with the burned out lightbulb and fuse. The truck drove away fixed everything working. 3mins later it was back with no turn signals. Next the brake lights have a dead short. The trailer plug was cut and pushed into the bumper. Removed the plug, and still have the problems. Disconnected the rear lights from the harness, removed the cab mount brake light, disconected the shift lock solinoid, unpluged the multifunction switch, removed the headlight switch, took the brake light switch off the pedel. When you press the brake light switch the fuse for the brake lights pops. fuse 13 pops as soon as you put it in also. The 4way flashers seem to work as they should.
Thank for any ideas.
Dave Powell
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Joined: Jan 2001
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From: Virginia
The brakelights and the turnsignal lights are one in the same. So they use the same wiring going to the rear. Sounds like you have a wiring problem somewhere from the cab to the rear bumper area. I would crawl around a look at the wiring all the way down the frame rail. Something is rubbed through or pinched in the wiring harness. I am guessing this is new used truck you have just bought? You never know what may have happened. Someone at onetime may have got stuck, and hooked a chain or something up in the frame rail, pinching the wires.
I just thought of one other possiblity. Someone cut and stuffed the trailer wiring in the back, so they may have had a brake controller mounted under the dash. If they took this out, and did the same cut and stuff routine, you may have some loose wires shorting out under the dash. There is a wire that went to the brake lights from the controller, so if you manually activate the trailer brakes by the controller, the brake lights come on, even though you are not touching the brake pedal.
I just thought of one other possiblity. Someone cut and stuffed the trailer wiring in the back, so they may have had a brake controller mounted under the dash. If they took this out, and did the same cut and stuff routine, you may have some loose wires shorting out under the dash. There is a wire that went to the brake lights from the controller, so if you manually activate the trailer brakes by the controller, the brake lights come on, even though you are not touching the brake pedal.
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Elder User
Joined: May 2002
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Problem solved.
The wire harness that feeds the dome light, and the cab mount brake light was pinched by the passinger side front seatbelt assembly on the floor. I guess when the truck was built it must have got in the way when the seat belt retractor was bolted to the floor and pinched. By replaceing the fuese for the dome light it caused a short that just got worse, till it burned into the damaged brake light feed to the third brake light. The wire harnnes has a connector behind the right front kick panel. This repair was fun. NOT. This is the second pickup truck i have seen this on.
SIGNED Happy Camper David P.
The wire harness that feeds the dome light, and the cab mount brake light was pinched by the passinger side front seatbelt assembly on the floor. I guess when the truck was built it must have got in the way when the seat belt retractor was bolted to the floor and pinched. By replaceing the fuese for the dome light it caused a short that just got worse, till it burned into the damaged brake light feed to the third brake light. The wire harnnes has a connector behind the right front kick panel. This repair was fun. NOT. This is the second pickup truck i have seen this on.
SIGNED Happy Camper David P.
