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Farmall & IHC Tractors Discussion Board

12v conversion wiring help!


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Posted by binder300U on February 20, 2010 at 16:01:40 from (206.212.229.240):

I recently converted my 300u to a 12 volt system. It seems to be wired correctly, it starts, everything works, but to date i have fried two alternators! everything is fine for about 4 to 5 starts/runs- charging kicks in about 1500rpms. Then i start up the tractor, and suddenly it won't charge the battery(warning light stays on, no matter what the rpms).

electrical system components:
original 6v delco starter with new 12v solenoid
delco 4 pole ignition switch(came on the tractor when i got it) with poles for ACC, BAT, SOL, and IGN
delco 12v coil
delco 3 wire alternator
new repro IH ammeter

wiring:
(8ga)BAT post on alternator to (L) post on ammeter
(8ga)wire from B post on ammeter to large post on solenoid
(4ga)wire from same large post on solenoid to +battery terminal
(1ga) wire grom -battery terminal to body
(12ga)terminal 1 on alternator to ACC on ignition switch thru warning light- tho wires into and out of the warning light are 16ga
(12ga)terminal 2 on alternator to BAT on alternator
(14ga) SOL on ignition switch to small post on solenoid
(12ga) BAT on ignition switch to (L) post on ammeter
(12ga) IGN to + post on coil
(12ga)light switch to (L) post on ammeter
(12ga)cigar lighter to power out(always hot) on light switch

One thing i noticed when the alternator charges- the ammeter needle sits all the way at the top of the gauge at first, then drops down to about 2/3 up the gauge.

anyone have any insight into what the prob cold be? thanks alot.


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