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1. 06:49 AM - Re: Engine Quit (Hopperdhh@aol.com)
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It sounds to me like the sense lead to the regulator is intermittent. The
fault may be internal to the regulator, or it may be a loose or broken
wire. I think on the Vans alternator hookup that one of the wires going into
the back of the alternator would be that lead. It may connect directly to
the field supply near the connector going into the alternator. At any
rate, carefully check that wiring by tugging on the wire while you have a
voltmeter connected and the alternator and master switches on, but disconnected
from the alternator.
If no problem is found with the wiring, replace the regulator (inside the
alternator), or replace the alternator and regulator -- regardless of what a
bench test shows. There isn't as much vibration on the bench as there is
on the Lycoming!
If the sense lead opens up the alternator may go "full field", or it may
not -- depending on whether there is a fail safe internal circuit to pick up
another sense point. (GM regulators have this safety feature. Not sure
about Nippondenso.)
Dan Hopper
RV-7A
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