Posted by LJD on December 26, 2011 at 18:20:09 from (75.194.178.227):
In Reply to: alternator exciting posted by INCase on December 26, 2011 at 16:58:23:
A 3-wire Delco 10SI or 12SI should charge instantly. Does not rely on any residual magnetism to excite.
A 10SI rated 61 or 63 amps must spin 1800 RPM minimum to charge.
A 10SI rated at 72 amps must spin 1600 RPM to charge.
Your crank pulley is probably at least twice the size as your alternator pulley, so worst-case the 10SI should start charging at 900 engine RPM. If not, something is wrong(alternator or wiring).
Now if you've got a huge diameter pulley on the alternator that make it run at only engine speed - then you can have a problem. Alternators usually are set up to run at 2X to 3X engine speed.
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