My buick has just died on me. seems to be a battery or alternator problem. If i give the battery a quick charge it will run for about 20 mins but voltage always drops. I have 14.2 volts witht he motor running then I flick on the light and heater and the volts drop to 13.6, I leave it running and check the volts every 5 mins and they always lower. It seems the alternator aint chargeing the battery.
I put to gether another alternator that I beleave to be good (not sure though) and it does the same thing.
Is there a way to check to see if the alternotor is chargeing the system, could it be a crack in the wireing.