Michael has a good point but I agree with JMOR any short that will kill a battery in minutes has to be in the positive heavy main battery cable. Is there a short tube that bolts on the bell housing bolts that the positive cable runs through? Is it shorting out in there? I don’t remember if heavy GM trucks had these but some pickups and or cars did. Anywhere else along the cable that it has a holder clamp around it that may have failed insulation that is shorting. Make sure you double check you connection at the starter so you are sure nothing is shorting there. Is the positive cable rubbing through along the frame or by the exhaust manifold? There is another possibility but it generally would not cause heavy sparking at the battery terminal, this is the possibility of an intermittent connection of a fuseable link. I believe those are located by the starter or on a connection stud on the firewall. If one of those was failing it would seem as though your battery was dead because all power would be lost.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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