Rear lights going crazy.
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Freshman User
Joined: Jan 2004
Posts: 43
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Rear lights going crazy.
1991 Full Sized Bronco....
I am hoping there is a wiring expert here that can help me. My driverside blinker and rear tailight went out and when I replaced the bulb, nothing. So I get under there and find out the brown and tan colored wires have fallen off the connector plug..completley corroded.
I took a look at the wiring diagram in the Chiltons manual and it looked like they just went ot he same colored wire on the other side fo the plug. so I jumped them over the plug to tha wire on the other side.
now with the headlights off everything works almost correct. (on the blinker it lights up th reverse light to a tiny bit. But when the head lights are on and I hit the brakes if lights up the reverselights and turns the tailights off.
What the hell did I do?
I am hoping there is a wiring expert here that can help me. My driverside blinker and rear tailight went out and when I replaced the bulb, nothing. So I get under there and find out the brown and tan colored wires have fallen off the connector plug..completley corroded.
I took a look at the wiring diagram in the Chiltons manual and it looked like they just went ot he same colored wire on the other side fo the plug. so I jumped them over the plug to tha wire on the other side.
now with the headlights off everything works almost correct. (on the blinker it lights up th reverse light to a tiny bit. But when the head lights are on and I hit the brakes if lights up the reverselights and turns the tailights off.
What the hell did I do?
Posting Guru
Joined: Nov 2004
Posts: 2,155
Likes: 1
From: sunny fla sometimes windy
check the ground It sounds like the lights are searching for ground! You will need a multimeter (not a lightbulb based tester!!) Find out which wires are which, put the headlights on only one should be powered thats your running light (short filament in bulb) now blinker on or brake pedal pressed should be intermittant voltage (blinker) steady (brake) now you should have one wire left (besides reverse light) that should be ground. Make sure the ground is good by turning on headlights and putting the positive lead of multimeter on the taillight wire and the negative on the ground wire you found. If its good strip them and reconnect them. I always say use multimeter because if you don't know exactly what you are doing and put a lightbulb tester on the wrong wire you while overamp the wire and possibly kill your computer! You should be able to find a VOMeter for $15.00 it will save you hundreds down the road so get one!
