Posted by JDEM on December 09, 2017 at 17:50:16 from (174.230.14.162):
In Reply to: 1 Wire or 3 posted by pat sublett on December 09, 2017 at 16:53:19:
Technically, a three-wire hookup does a better job of charging the battery. A one-wire self-exciting alternator has no way of monitoring actual battery voltage. It does not make much of a difference if the battery is not very far from the alternator though.
I prefer the three-wire, but one-wire works well enough. A Delco 10SI (most commonly used on tractors) has to spin at 1600 RPM to start charging with a three-wire hookup. With a one-wire it often has to spin 2000 RPM before it kicks in. No big deal.
Three-wire hookup is easy enough. Excite wire just needs a $1 five-amp diode to power cannot backfeed. Or - if you have an automotive type ignition switch - no diode needed. Just hook the excite wire to the ACC terminal and it gets isolated from IGN when the key is turned "off."
The one-wire setups are not just from the aftermarket. AC Delco also supplied them OEM but not for use on cars or trucks.
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