I have a 2000 Suburban and I seem to be having an electrical system problem but cannot seem to isolate it. My low battery/voltage indicator lights up at different times, accelerating, decelerating, or just cruising. I recently replaced the alternator, which was bad but I was having the same problem and it checked good about a month before it finally died. Is there something in the line somewhere that might be restricting or not restricting and it is frying my alternator? When I put a multimeter on it, everything reads OK. This one has me puzzled.

 

hmmmmm well just look at this for the hell of it. i put mine on there and it didnt say it was charging but i forgot to put the second electrical plug into the alternator. just a thought. it took me a while to figure it out

 

Try to keep your meter with you in the truck. Rig it up to a cigarette lighter adaptor and plug it in the the light is on to see if the alternator is accually charging or not.