Posted by Bob M on November 27, 2012 at 13:58:53 from (69.207.86.27):
In Reply to: Re: alternator posted by morris roessler on November 23, 2012 at 22:10:50:
That's pretty much how the 10SI alternator works - at startup the engine's gotta be run up until the alternator shaft is spinning 2,500 RPM or so for it to "turn on" .
My Super M with the 10SI alternator needs to be run up to 1/3 governor or so to get it to start charging; so does a buddy's JD A and 4430. Back in the 80's I owned several GM vehicles that needed to be "goosed" at startup to extinguish the charge light too.
If it really bothers you there are a couple fixes:
1 - Install a smaller pulley to spin the alternator faster.
2 - Swap the alternator you've got for one with a LOWER output rating. Most aftermarket rebuilds are 55 or 61 amp. Replacing it with 37 or 42 amp unit will begin charging at noticeably lower RPM. (It sounds counterintuitive, but that's how the 10SI family behaves....)
Myself I simply live with it. After a cold start I'll let my SM idle for a minute or so. I then slowly pull the governor until the idiot light goes out then idle it back down until ready to put it to work.
----
To your diode question you've probably got a 1N4004 or equivalent (it's pretty small!). But any diode rated for at least 100 PRV and 1.0 amp forward current will work.
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