s-10 loses electrical power driving

[Rynobub]

Hi i was just out recently running an errand and my truck stalled out
while i was driving home. I popped the clutch and was able to get it running
again but i noticed the volt meter was jumping all over the place (down to 9 and
back up to 14)...i could feel the power loss. I've notice my meter going
low before with the a/c on and i shut it off and it starts charging the battery
again. The service engine light went on a couple of weeks ago but the
truck behaved normally. It also died completely 100 ft from my house
and i was able to restart it and get in the driveway (sounded like it cranked
over normally). Any ideas?

[Scrapper]

i would have alt checked at autozone or advanced,or if you got pep boys around you at no cost also have fuel pump tested,and make sure your battery cables are clean....

[Rynobub]

may have fixed it. cleaned the battery terminals and the ground on the
block. drove it around for about 5 miles...meter stays around 13 volts
and it doesn't fluctuate.