The Stovebolt Site Forums The Shop Area The Electrical Bay Strobe Lights on 66 C10

When my truck is idling, the needle on the amp meter gets buried to the right. When I turn the lights on, they flicker or blink intermittently. As this is happening, the needle on the amp meter bounces up and down in rhythm with the disco lights. I have replaced the battery and the alternator. Actually, the battery was replaced a while ago, but then I ran into this issue of an alternator with an open diode, which kept killing the battery. So, now, I have replaced the alternator. When I picked up the new alternator, I had the battery tested and was told that it was good. I am electrically challenged, so I am not sure what might be causing this, or what I should be checking. Anyone have any ideas?

if it's showing full charge at idle, what does it do when you up the revs? that needs to be sorted out before messing with lights, or rather, before even turning them on .... the blinking lights are likely the thermal breakers on the light switch, and likely to be something drawing way too much current, such as a fried wire somewhere - have you looked over the wiring? is it time for a new wiring harness?

Bill

My panel truck use to do that, Batt, alt all good, switched out the voltage reg with one i had laying around and it stopped.