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Sir Nibble

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  4. Sir Nibble
    Field current aside. It sounds like the alternator is struggling against load to raise voltage. In other words, bulk phase. The low current suggests a faulty alternator. I've just thought of a test for negative diodes. Check and compare AC voltage between W and B+, and W to negative. Again, the readings should match.
  5. Sir Nibble
    Odd one. Sounds like a low performing alternator. Yes, I've read the manual just before phoning, being told that it must be remembered that an alternator is only a single phase machine, and giving up! Probably the same bloke who thinks 13A is a credible field current (it's actually what we in the trade call "burned out").
  6. Sir Nibble
    Now we have field current quoted at 13A????? First thing, whoever wrote that has no idea at all, none, ignore them and reject anything they say or do. It sounds to me like a positive output diode failure. Check and compare voltage at B+ (output) and D+ (warning light) terminals with engine running. Should be the same give or take about a quarter of a volt.
  7. Sir Nibble
    First off, 13.6V is stupidly low, where are you measuring it? Agree with the 10A comment above, whoever wrote that would have rejected every alternator I have seen in more than 40 years of rebuilding them. "Helpful" is not the word I would use for Sterling.
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