Altenator ????

Well Christmas eve night i was driving home from My grand parents house and noticed my battery gauge was really low, hovering a little over 9 volts. So i figured it was my Alt. Changed it out and still had a warranty from the last one. But i bought the Heavy Duty one from Napa. Well almost exactly 2 months later ( 2-25-07) I was driving home from work and noticed the exact same thing. And my jeep hasnt seen any major mud since i changed the last one, i mean the altenator is still silver! but im just wondering why i am having such a problem with these things? could it be the napa brand?? thanks.

reman alt is probably bad. check all wires to make sure they are in good condition and clean.

First things first - verify the voltmeter separately! The RENIX IP voltmeter is a notorious liar - mine typically reads ~11VDC, but my alternator output is a rock steady 14.6VDC...

Check voltage at the battery with the engine running before you suspect anything else.

If you have to replace it again anyhow, I honestly don't think the "big chain" warranties are worth anything. Find a small shop, and deal with them. They'll have a better bench, better QC, and you usually don't need their warranty.