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How can I check the coil? It is the type mounted to the top of the dist. Thanks Jim Aka Wilseya
 

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Never mind that. If it's an internally mounted coil than the reg is built in and should not be the problem. It's built right into the alternator.

I would pull the alternator. Believe me, even if they're new, most (like Kragen, autozone etc.) are rebuilt in Mexico and about 1 out of 3 are bad out of the box. Check the amperage on the batt. Pull the leads off the alternator, if the amperage increases, I'll bet it's bad. Also like the other dudes said, check the hot lead from the battery on down. Chebby's are notoriuos for burning up 12v wires down by the starter. Down there somewhere on the firewall, should be mounted an isolator or relay. Check that too. Just keep pulling stuff and check the batteries amperage along the way. If you get a big change in amperage, I bet you've found the culprit.

Start with the alternator though. Another way if you have a crappy vom, just charge that batt and make sure it will start the truck. Pull all leads to the alternator. If it starts 6 hours later..... <IMG SRC="smilies/wink.gif" border="0">
 
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