Overcharging
Posting Guru
Joined: May 2015
Posts: 2,036
Likes: 5
I had some issues with my truck when it stopped charging..
I replaced the alternator and regulator, still wouldn charge, turns out the wiring wasn exactly right, my truck is missing one of the wires, and it really had me going for a while, i wired everything up per the diagram and it would over charge, truck wouldn shut off, it was feeding back the the ignition,
So i had a red wire that goes to the regulator from the factory wiring terminal s
A yellow that goes from the hot side of the battery to the regulator terminal A
Ran a ground just like you did
And from the f terminal to the stator on the alternator
That game me high 13's low 14's all the time weather its idle or full throttle, i did not hook any wire to the f (field) on the alternator
May not be right but if it works for now you can do a 3g later anyways
I replaced the alternator and regulator, still wouldn charge, turns out the wiring wasn exactly right, my truck is missing one of the wires, and it really had me going for a while, i wired everything up per the diagram and it would over charge, truck wouldn shut off, it was feeding back the the ignition,
So i had a red wire that goes to the regulator from the factory wiring terminal s
A yellow that goes from the hot side of the battery to the regulator terminal A
Ran a ground just like you did
And from the f terminal to the stator on the alternator
That game me high 13's low 14's all the time weather its idle or full throttle, i did not hook any wire to the f (field) on the alternator
May not be right but if it works for now you can do a 3g later anyways
Postmaster
Joined: Dec 2011
Posts: 3,860
Likes: 7
OK, the way it's supposed to be is:
Regulator has 4 terminals: I,A,F,S.
Alternator has F,S terminals and the big power out terminal.
Wiring should be:
Wire from Regulator F to Alternator F
Wire from Regulator S to Alternator S
Wire from Regulator A to Alternator power out or battery+.
Wire from Regulator I, /through a small light bulb/ to switched power. An indicator light bulb works great(it is usually connected through the dash light).
If you don't hook the I terminal up through a light bulb, the regulator will get hot and burn out sooner or later. Alternator will also get hot.
Once you have this hooked up, with the key on engine off, the light bulb should be bright. Once you start the engine, the light will go out as the regulator gets it's power from the alternator instead of the battery.
I've used this setup on two old tractors thus far; parts are cheap and the alternators tend not to fail easily due to the electronics being in the regulator. These alternators used to be run with a mechanical regulator on older equipment, but the electronic regulators you get from Napa are far better.
Regulator has 4 terminals: I,A,F,S.
Alternator has F,S terminals and the big power out terminal.
Wiring should be:
Wire from Regulator F to Alternator F
Wire from Regulator S to Alternator S
Wire from Regulator A to Alternator power out or battery+.
Wire from Regulator I, /through a small light bulb/ to switched power. An indicator light bulb works great(it is usually connected through the dash light).
If you don't hook the I terminal up through a light bulb, the regulator will get hot and burn out sooner or later. Alternator will also get hot.
Once you have this hooked up, with the key on engine off, the light bulb should be bright. Once you start the engine, the light will go out as the regulator gets it's power from the alternator instead of the battery.
I've used this setup on two old tractors thus far; parts are cheap and the alternators tend not to fail easily due to the electronics being in the regulator. These alternators used to be run with a mechanical regulator on older equipment, but the electronic regulators you get from Napa are far better.
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