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It sounds like the alternator isn't putting anything out. Those wires on the alt are directly connected to the battery, so all you're measuring is the battery voltage on two different ends of a wire. The readings sure better be within millivolts of each other.
Despite it being a new alt, it sounds like maybe the main recifying diodes are fried or the voltage regulator is bad. You could try swapping out the regulator to see if maybe it has failed early.
Oops.. I take that back.. I got the voltage difference reveresed. The alt is putting something out, we know that because the voltage is higher at the alt terminals than at the battery. Assuming the 2mv isn't just fixturing issues, and making other assumptions, the alt is putting out at least 20 Amps, probably a lot more (like perhaps its full load). Are you sure the glowplugs are not stuck on? Your super loud woofer isn't sucking tons of juice? You are not trying to run everything electrical in the car all at once?
Last edited by patbob; 12-27-2009 at 06:42 PM.
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