Posted by rvirgil_KS on October 24, 2017 at 07:28:35 from (50.93.228.228):
In Reply to: Re: 12 volt posted by Bret4207 on October 24, 2017 at 05:15:41:
"There is a diode made to fit in the alt wire that limits back drain from the alt. I've been told this is totally unneeded, yet it's recommended by alt shops I've dealt with."
With a Delco 3 wire alternator, a kick start voltage is applied to #1 pin on the edge connector to start the alternator charging. Once alternator kicks on, voltage from internal diode trio supplies power to the regulator to sustain operation.
#1 wire connects back to the switch output which also feeds the ignition coil. When the engine is switched off, the diode trio in the alternator continues to supply power and can feed back through the switch and continue to power the ignition preventing the engine from shutting down.
A diode, lamp, or resistor in the #1 line to the switch are three methods of blocking or limiting backfeed current to the switch and ignition and allowing the engine to shut down.
Voltage to #1 pin is switched on and off by ignition switch. Large output stud and #2 pin are connected to battery source and are always hot whenever the battery is connected.
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