1988 Dodge d100 my lights are flickering
It's a battery or ground problem. You mean all of them, headlights, dash lights, or what? The flickering is often caused by a corroded or deteriorated ground point for the lights, less common is a hot wire connection that is loose or not contacted well. Your headlights and front park lamps and any side marker lamps, I think they would all have a common ground, or maybe each side has it's own ground up front there. I'll try to find a wiring diagram for what you need, in the meantime, take off first the negative of the battery and then the positive post (for safety, always remove the negative first and reconnect negative last), clean both battery posts and the end of cables or the clamps that go on the posts. Any corrosion, green or white colored, is not good, and can lead to serious resistance in the connection, and hinder the electrical system. Those connections must be clean and tight, remember positive hooked up first, then deal with the negative post. Your truck is old, subject to rust, better check all your ground connections. The original negative cable had a large ground to the engine block and a smaller wire ground to the body, somewhere grounded in front of the battery to the frame. If rust is an issue, you can always find a better ground point-to clean metal free of paint.
If you know all this and you know the battery connections are clean and tight, then look for the ground point for the flickering lights in question. If you have a voltmeter it is almost essential to the testing or checking of any electrical circuit.
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