Alternator is good but lights are dimming?
I have a 1989 Ford Bronco 2, whenever I shift gears from park drive etc the lights dim same with just driving sometimes the lights will brighten up then immediately dim again I have a new battery and I had the alternator checked and its fine. I don't know if some wires are corroded or not but if you know what the problem might be exactly or the price it might be to fix it that would be nice.
Well why don't you check to see if the wired are corroded. DUH
Run a ground wire from the engine block to the body.
You may have a weak ground connection. Check all the ground wires and especially the one on the body. Also check the ground and hot wires going to the battery. They may look good but if you see a bulge in the wire anywhere it needs replacing. Also check the output of the alternator. It should be 13.5 to 15.5 volts as tested with a digital volt meter set to the 20 Volt DC scale. Any less and the alternator is not putting out enough voltage.
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