hello everyone i have a problem. i have a 95 f150 with a 300 i6 when driving at night with lights and heater on when i come to a stop the volt meter has a huge drop in power all interior and exterior lights dim very low sometimes the volt meter will come back up slightly but not very much. ive changed plugs,wires, distributor, distributor cap,rotor,alternater. im at a lose now and and all help would be appreciated

 

Battery may be beginning to go bad. You can bring it in to get checked at any place that sells them. But first try cleaning the terminals on your battery and cabled to get rid of as much corrosion as possible. I've seen corrosion making a bad connection between the terminals and cable clamps cause this, too.

 

Hows your belt? Does it slip or squeal ? That could be the culprit

 

I agree. A guy I work with had so corrosion between his cables and it caused the gauges to ack funny. Sounds like a power problem. Battery, cables or alternator. Good luck