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WD45 Not Charging Battery

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04-14-2002 18:15:56

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My tractor has a 6 volt system. This tractor is set up with a cut off assembly on the generator and resistor unit in switch that controls voltage. The tractor does not have enough charge in the battery to start and the battery is not being charged when running. The following is what I know:

The cut off on the generator is new.When the tractor is shut down the cut off doesn't cut off. So the battery drains. To make the cut off work I have to remove the negative wire from the battery. The one thing different in the wiring is the short wire from the fuse on the light switch/resistor unit is connected to the positve post on the anmeter. The manual wiring diagram shows this wire should go the the negative post on the anmeter which is connected to the wire coming from the cut off on the generator. When the tractor is running the anmeter is not showing any charging rate.

The generator is fine. It generates only when it is disconnected from the generator wire from the cut off. When the generator wire is connected to the cut off it doesn't generate.

Does any one have ideas what might be the problem?

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Duey (IA)

04-14-2002 19:26:38

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 Re: WD45 Not Charging Battery in reply to Bill, 04-14-2002 18:15:56  
With the engine off, the wire coming from the starter feeds in to the + side of the amp gauge, then through the gauge and out the - side to feed whatever needs voltage (lights, ignition etc.) . The cut out relay shuts off the voltage that would go back into the generator. When the engine is started, the output from the generator energizes the cutout relay to allow generator voltage to back feed to the - side of the amp gauge and to everything needing voltage (lights, ignition et.). Excess voltage goes through the amp gauge out the + side to the starter then into the battery to charge it back up. The resister on the light switch is adjusted manually to regulate how much voltage goes to the field magnets in the generator. (more voltage in = more magnetism = more voltage out to the battery) Soooo only one wire should be on the + side of the amp gauge (from the starter). Resister wire from light switch hooked to the Field on the generator. Bat post on cutout relay hooked to + side of amp gauge. My guess is that the cutout relay is wired wrong to the generator (backwards)and the light switch is wired wrong to the amp gauge.
I hope this explains the system and why yours doesn't work! Duey

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04-14-2002 19:11:00

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 Re: WD45 Not Charging Battery in reply to Bill, 04-14-2002 18:15:56  
the "little wire from the light switch fuse" should go to the negative ampmeter terminal. the positive side goes to the starter wire which is connected to the negative side of the battery. if you connect the "small wire" from the light switch fuse to the positive side of the ampmeter you have taken the ampmeter out of service and it will not read anything. this does not explain why the battery does not charge.
--if the generator is good and the cutout is new, why wont it charge? check like this.
1. make sure the ampmeter is in the circuit right.
2.take the "A" wire from generator termnal to the cutout, and touch on the other side of the cutout(bypass cutout) now does it charge? if so then the cutout is not closing in.
3. take the "F" wire off the generator and ground it to the tractor frame, this bypasses the light switch and its ground wire? if it charges now, the light switch is bad or not grounded.
--who do you know the generator is good? if it is, i would guess the light switch is not grounded or the resistor inside is bad.
---the cutout is normally open. it will only close when the generator puts out 7 volts and is pushing toward the battery, so a bad ground on the light switch will make the cutout malfunction. when you shut down the motor, the generator voltage drops and the 6 volt battery voltage runs backward and the cutout then opens to stop the flow of current to discharge.

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