Thread: Battery or Alternator bad?

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one more thing to check run a jumper wire from the alt case to ground the alt has to br grounded I had a couple of times diy ers came to my shop after puting in new motors thr paint was so thick it would not ground that will make you scrach your head a few times ted

Guys, great info and I have plenty to do this weekend because of it!

Took my alternator to AutoZone after work last night and it tested GOOD too. Got another guy that was interested in Hot Rods.........Like finding gold. Right!? It past the test, however, he did tell me that since it's off the car it only tests to see if it's putting our amps. NOT how many..........He said I should put the car back together and bring it down and he'll wheel out the cart that will tell us exactly how many amps it's putting out. He works all day Saturday so we will test it at idle, then at 2,000 rpm and the car HOT. See what we get there and then turn lights radio and electric fan on etc!

My luck is bad! Bought a nice new digital volt meter there last night for $36. Took it home and put it on my battery, set at 20 volts setting on the dial. BOTH the ground and positive wires hot super hot and almost melted! Would give no reading at all just stayed at 0.00. Used my old dial voltmeter (non digital) and worked just fine. Did my car battery and truck battery. Same result on both.