Okay guys here's the thing when I purchased this truck my friend didn't attempt to hide the fact the alternator was bad. When I first got it home you could pull a battery cable off while it was running and it stayed running that was only for a day or so. The next time I attempted it it would fall dead. I changed the alternator yesterday gave it a boost. Let it run a bit at higher idle. Killed it and the truck wouldn't start back. I put a good hot battery on it today just Checking and had 12.86 volts. Started the truck and with it running I still had around the same voltage at the battery post once started even with the weak battery the alternator had no problem powering the entire vehicle with ease. I read about the battery light and when I first bought the truck a few weeks ago even with it running the battery light would be on. Seems like it went off about the same time the truck officially stopped charging after getting it home. Although I've got some cluster issues (sometimes the cluster works sometimes it don't) anytime you turn the key to the on position the battery light stays lit. Sorry for so many post but I really need this truck going. Any help or directions are more than appreciated. It's a 1998 Frontier by the way.