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New alternator: 13.2 at B+, 14.1 at D+. Why? 200 1993

posted by  woodshavings on  Mon Apr 3 20:11 CST 2023
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last visit: Fri Oct 24 08:22 CST 2014
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Thanks Phil.

Thank you from stopping me from doing something stupid - pulling the B+ cable and measuring the output.

I was following the other thread Build had started, and I don't think my problem is similar. I followed Art's advice, grounded the exciter wire to the block, bulbs burn brightly, and then plugged it back onto D+, and read 1.62V with the lights on, and engine not running.

I've cleaned up all the engine bay grounds (again), and no substantial change. I wish I had the previous unit so I could put it back and see what I get.

I'll look for an automotive electrical shop to test the alternator. I've not done this in the past. Anything I should ask or look for? When they load it up, should the B+ voltage be 14.1V like the D+?

One other thing I thought about - will the alternator read low on the B+ IF the battery is not fully charged? The Interstate battery is 3 years old and is holding 12.59V with everything off.

Thank you!






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New New alternator: 13.2 at B+, 14.1 at D+. Why? [200][1993]
posted by  woodshavings  on Sun Mar 26 09:48 CST 2023 >


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