Multiple alternators not charging
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Multiple alternators not charging
Hey all. 1999 F-350 powestroke 4x4 sngle alternator setup. Battery light came on this weekend, found alternator was putting out zero volts at the B+ terminal. Replaced with remanufactured NAPA and I was getting 3V at the B+ terminal on the alternator with the large battery lead disconnected but the 2 wire connector in place. Decided maybe a bad remanufactured so I exchanged for s new NAPA, same thing, tried a remanufactured motocraft, same thing. From what I understand these are internally regulated and I have 12V at both the smaller green and orange wire in the 2 pin connector. I believe those wires power the alternator and as it runs I should have 13.-15 volts coming off the large B+ terminal on the back but I'm still getting around 3. NAPA did say they're having a bad batch of replacement alternators but I would suspect after 3 replacements there's something else up. Any secrets? Tried clearing codes with a snapon solus between alternators, still nothing.
Cargo Master
Joined: Dec 2015
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Are you getting the battery light when first turning the key?
I'm not sure if it's possible to momentarily full-field these internally regulated alts to try to excite them, but I'd think so....with a bit of searching
I'm not sure if it's possible to momentarily full-field these internally regulated alts to try to excite them, but I'd think so....with a bit of searching
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Battery light comes on KOEO, then goes out when started and everything connected but battery voltage starts falling from 12.6,12.5,12.4 etc. I think I read somewhere that the 2 wire connection could be reversed on newer alternators?
Postmaster
Joined: Nov 2015
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From: Colorado Springs
Hey all. 1999 F-350 powestroke 4x4 sngle alternator setup. Battery light came on this weekend, found alternator was putting out zero volts at the B+ terminal. Replaced with remanufactured NAPA and I was getting 3V at the B+ terminal on the alternator with the large battery lead disconnected but the 2 wire connector in place. Decided maybe a bad remanufactured so I exchanged for s new NAPA, same thing, tried a remanufactured motocraft, same thing. From what I understand these are internally regulated and I have 12V at both the smaller green and orange wire in the 2 pin connector. I believe those wires power the alternator and as it runs I should have 13.-15 volts coming off the large B+ terminal on the back but I'm still getting around 3. NAPA did say they're having a bad batch of replacement alternators but I would suspect after 3 replacements there's something else up. Any secrets? Tried clearing codes with a snapon solus between alternators, still nothing.
Are you having NAPA check these “new” alternators before even leaving the store? if they know they’re having a bad batch they should be doing that anyway. How are your grounds looking …clean, tight? How old are the batteries?
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