ceengland7(at)gmail.com
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 Posted: Wed Jul 23, 2014 12:00 pm Post subject: one-wire alternators- the subject that just won't die |
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Hi Bob,
Please forgive me, but I need a refresher on why one-wire (internally regulated) alternators are no longer recommended for a/c; even banned from 'the Book'. I do remember (scratch that; know from experience) that if the B-lead contactor opens while the alternator is under load, there can be a 'load dump' (high voltage spike) issue that can kill the electronics (the regulator) in the alternator. Makes sense. But if the only way the B-lead contactor is allowed to open is due to an overvoltage fault, does it matter? At that point, it's a given that the regulator is already toast, and the entire alternator will be swapped out to fix it. Given the very high reliability of modern automotive alternators, and that the only time the B-lead contactor would need to open under load is during a true OV fault event, what's the compelling reason to keep the 'not recommended' philosophy?
I've had a couple of different career paths involving running a soldering iron & modifying stuff (both consumer and industrial electronics maintenance), so I'm not 'afraid' to dig into an alternator to modify it for external regulation. But I'm of the 'if it ain't broke, don't fix it' school.
I'd like to be educated on what I'm overlooking in terms of risk, failure modes (fire?), etc.
If it's reasonable to bring the one-wire alternator (with contactor style OV protection)back into the mix, the next question will be about integrating a backup dynamo style alternator without spending close to half an Aviation Unit for the hardware. 
Many thanks,
Charle
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