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New problem(to me) LEDs


88xltranger

Active Member
Joined
Aug 14, 2020
Messages
102
Reaction score
35
Points
28
Location
NC
Vehicle Year
1988
Make / Model
Ford Ranger
Engine Type
2.9 V6
Transmission
Automatic
2WD / 4WD
2WD
1988 with 2.9, installed LEDs in all exterior lights and replaced hazard and flasher relays with externally grounded LED compatible ones. I've never had a problem in any vehicle I've put them in but this one is giving me weird problems.
Key off, brake, signals and tails work correctly.
Key on, one tailight with come on dimly. Pull the bulb and it jumps to the other side. With that in mind, if I pull the light switch with key on, the tails light up as if I'm pressing the brake. Im getting about 5 volts on the SIGNAL side of the lamp wiring with key on.
I've replaced the light switch, turn signal switch, and the lights in the rear but the problem persists. Any ideas? I will attach the wiring diagrams I am using.
 

Attachments



88xltranger

Active Member
Joined
Aug 14, 2020
Messages
102
Reaction score
35
Points
28
Location
NC
Vehicle Year
1988
Make / Model
Ford Ranger
Engine Type
2.9 V6
Transmission
Automatic
2WD / 4WD
2WD
Another note, I have read about older vehicles and LED 1157 bulbs causing backfeeding but I'm not sure that is what is happening here. I may be wrong but I have tried several different bulbs.
 

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