I have a 1993 Dodge Dakota, when I turn my running and head lights on my tail lights don't come on, and my brake lights and turn signal doesn't work. But when they aren't on, the brake lights and turn signal run just fine. Although the hazards work anytime (thank god). I have tried cleaning off the grounds, replacing all the lights, replacing the fuses and messing around with the electrical harness under the truck. But nothing seems to be working, any ideas? anyone with the same problem? Forgot to mention the front lights on my truck (headlights, running lights) work just fine. Thanks
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With a test light check if you have power there with lights on and with lights off, compare left side with right side as far as location in the tail lamp plug for the tail lamp park lights.Trace the harness back to the left side underneath usual corrosion in this area.
Only with the head-lights on? What about with just parking lights? And I assume that means it doesn't do it unless the lights are on? My first guess would be either a bad ground at the left (drivers side) tail-light, or possibly a 1156-type, single-filament bulb being inadvertently placed in the socket that calls for a 1157 double-filament bulb. That may not be your problem, but what that does is makes a short from the tail-light power to the brake-light/turn-signal filament in that bulb.
One thing to do too is check the turn-signals to see if they work properly with and then without the lights on. Make sure it isn't the tail-light filament flashing. It may flash, but won't be as bright as the proper filament is.
I hope this begins to help, and I'll watch for a response.
The ground wiring on newer vehicles is a little complicated. Older cars, the ground would have been to the body around the tail-lights, but these have a ground wire in the harness and is connected to the turn-signal switch, and other sources. I don't think you have a ground problem. Does the fuse blow as soon as you press it into the fuse-block, or when you step on the brake? I believe you have a dead short somewhere, possibly a pinched turn-signal wire close to the tail-light assembly. Brake lights work through the turn-signal wires from the turn-signal switch on the steering column. That's how you can have one side blinking for turn while the other side stays on for brake. I'm kind of shooting in the dark here because I don't know what all you've done. If you replaced the turn-signal switch in the steering column, you may have pinched a wire or something there. Another thing, if the fuse doesn't blow as soon as you press it in, will both turn-signals work as long as you don't press on the brake? If you can provide a little more information, I might be able to help you more. One last thing....Have you replaced tail-light/turn-signal bulbs? If so, be sure you used the right bulb. You should only have two bulbs, one for back-up lights and one 1157-type combination for tail-lights and turn-signals. I have seen people use a single contact (1056) bulb in place of a 1157, which creates a short from brake/turn-signal back into the tail-light circuit. I do have a 1994 Dodge Dakota.
These are all different circuits. The brake lights are on a 10amp fuse - the headlights are on a 50amp fuse - and the parking and dash lights are on a 20amp fuse. Do you have power going into the headlight switch and the brake light switch ?