self exciting an alternator
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Joined: Nov 2000
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From: Albuquerque
self exciting an alternator
No I don't mean rubbing it real hard!
I have a Power Master 140a alternator that can be run either one wire or three wire. By connecting a reference voltage to terminal no. 1 it "self excites" or turns on immediately without need to rev the engine as in a one wire set up. Mine works in this fashion.
However if you have a factory amp guage you need a diode in series or the engine will not turn off with the key. My problem is with the diode in there it will not self excite. Very perplexing! The diode checks good, the band is toward the alternator and voltage is present on it's end with the key in run position.
Any ideas? Do I need an exocism???
I have a Power Master 140a alternator that can be run either one wire or three wire. By connecting a reference voltage to terminal no. 1 it "self excites" or turns on immediately without need to rev the engine as in a one wire set up. Mine works in this fashion.
However if you have a factory amp guage you need a diode in series or the engine will not turn off with the key. My problem is with the diode in there it will not self excite. Very perplexing! The diode checks good, the band is toward the alternator and voltage is present on it's end with the key in run position.
Any ideas? Do I need an exocism???
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Joined: Jan 2001
Posts: 56,984
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From: Virginia
You only need the diode inline with the alternator terminal if you are using the same 12 volt source that the ignition coil uses(which is the case in most older vehicles). Try putting a small light bulb that is used for the dash lights in place of the diode, and see how that works. The engine may coast a little bit, but it should stop. The other method would be to use a relay to turn the power on and off the terminal. This would seperate the terminal from the ignition coil power and let it stop.
I do not know if your year has it, but some of the 80's trucks had seperate sections to the ignition switch. If you put the alt terminal on a seperate section from the ignition coil, the engine should stop.
I do not know if your year has it, but some of the 80's trucks had seperate sections to the ignition switch. If you put the alt terminal on a seperate section from the ignition coil, the engine should stop.
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