Posted by John T on November 04, 2007 at 14:36:21 from (66.244.83.147):
In Reply to: Diode posted by Bugsy on November 04, 2007 at 09:08:32:
Bugsby, I'm just not sure how you have that alternator wired (wonder if its correct) and just where you placed that diode cuz what youre saying makes me think shes wired wrong or else the alternator has a problem BECAUSE if the diode is in the lil side No 1 termianl Excitation circuit AS IT SHOULD BE it should be wired to the ignition switches IGN output terminal (same as input to coil) such that it get voltage ONLY when the ignition switch is on THEREFORE when the switch is off there shouldnt be any connection there and NO RESULTANT BATTERY DISCHARGE CURRENT.........at least from that circuit, possibly elsewhere from the alternator if it has a problem????????????
Nowwwwwww if you had the alternators lil side No 1 excitation terminal circuit ALWAYS wired hot, it will draw current even when the switch is off tractor not running THATS BADDDDDDDD ANDDDDDDDDD IF you prevented that from drawing current by placing a diode in the circuit, fine??? buttttttttttttttttttt with that diode wired that direction she cant then draw excitation current as needed when you start the tractor for a fast alternator kick in.
Id sureeeee like to know first how shes wired and second if when you wired that diode in to stop the discharge she now charges as soon as you start the tractor????????? I have a suspicion you may have the alternators excitation cirvcuit always wired hot (not via ign switch or coil as should be) and second maybe you used a diode incorrectly??????? Or else the alternator is bad and theres another reason for the discharge ????
YOU DONT WANT A DIODE IN THE MAIN BIG ALTERNATORS OUTPUT CIRCUIT I guess one could be used there BUTTTTTTTTT it would have to be like a large high rated 50 amp diode versus the few amp diode required in the excitation circuit. Thats NOT the normal way of doing things .........
SOOOOOOOOOOO if you indeed had a discharge and also if indeed a diode stopped it, Id like to know where it is. The GM 10 SI family of 3 wire alternators has 2 lil side terminals (1 is Excitation, 2 is voltage sensor) and theres the big main output stud on the rear which wires to the load (NOT batetry/starter) side of the ammeter. The lil No. 1 wires to the IGN output on the ignition switch or else on the high input side of the coil. The lil No 2 usually jump/wires to the big main rear output stud. In the No 1 excitaion circuit I dont normally even use a diode but prefer the safety current limiting resistance of a 10 ohm resistor (better safe then sorry is my motto) although many use a diode NOT an problem whatsoever, its purpose, which a resisitor usually takes care of also, is to prevent the engine from running even after the switch is turned off by preventing backfeed.
Again this allllllll depends on what alternator you have and how its wired.............
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