Re: Q for Bob M or others - diode in 3-wire, start

Posted by Bob on December 21, 2004 at 20:41:47 from (66.163.134.177):

In Reply to: Q for Bob M or others - diode in 3-wire, starter s posted by Dave in CT on December 21, 2004 at 20:15:11:

The wire size to the #1 terminal is NOT that critical. Even lighter will do.

If you don't like the idea of adding a switch to excite the alternator (and having to remember to turn it off), get a 2-terminal N.O. oil pressure switch that turns on at low pressure, and hook it in-line between a source of battery voltage, and the #1 alternator terminal.

When the engine is up and running, there is then voltage to the "excite" terminal, and when the engine stops and there's no oil pressure, the voltage to the "excite" terminal on the alternator shuts off.

BobM has a diagram posted showing the hookup of thoil pressure switch. The use of the "idiot lite" with the oil pressure switch is OPTIONAL. The system will work with or without it.

• BobM's diagram

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