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Re: Generator/regulator i.d. from photo

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Bob M

05-22-2014 07:24:14

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Colin - Looks like an aftermarket solid state cutout.

A couple tests:

1 - With the engine running half-throttle or faster, jumper the two cutout posts together with #12 or heavier wire (expect a spark when you connect!). If the ammeter shows a charge with jumper connected the cutout is shot.

2 - Disconnect both wires from the cutout. Now take a VOM or DMM and measure the resistance between the two posts in both directions. A good cutout will show infinite resistance one direction and nearly 0 resistance the other. (If resistance is infinite (or 0) in both directions the cutout is bad.)


Your OEM wiring looks pretty tatty. A new wiring harness - either purchased or home-made - would be a good investment!

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05-22-2014 11:34:15

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 Re: Generator/regulator i.d. from photo in reply to Bob M, 05-22-2014 07:24:14  
Right! The wires had been upgraded after this photo. I'll run these tests. I notice that the field wire is permanently attached to the case, and the generator wire shows 15-20volts at idle.

Normal behavior?


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Bob M

05-22-2014 16:08:27

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 Re: Generator/regulator i.d. from photo in reply to ccaissie, 05-22-2014 11:34:15  
Colin - 15 - 20 volts at the genny ARM terminal while idling says the generator is OK but that the cutout has "failed open" (infinite resistance).

Jim's advice to replace with a voltage regulator is right on. Do this and your battery will thank you with longer life and more reliable starting!

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05-22-2014 15:19:19

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 Re: Generator/regulator i.d. from photo in reply to ccaissie, 05-22-2014 11:34:15  
Kinda normal!
You have (probably) a 3 brush generator. It has been wired for full output all the time. (third brush location on the commutator is adjustable to manually regulate charge rate)
If the device shown is a solid state cutout, as Bob M is indicating, and I agree, and if it is "open" meaning it is basically a burnt out light bulb, the voltage will be that high because the gen is mot loaded.
The best solution for battery life is to use a voltage regulator (two regulating devices inside, one is a cutout, the other controls the grounding of the field to assure correct battery charging)
The third brush is moved all the way toward the fixed brush as far as it will go.
The Field terminal on the gen (now grounded) is hooked to the F terminal on the regulator.
The Arm terminal on the regulator (it might say GEN on it) is connected to the Arm terminal on the Generator (now connected to the existing cutout)
THe Bat terminal on the new regulator is connected to the wire now connected top the other end of the bad cutout.
No other connections are needed.
Make sure the new regulator is grounded to the tractor or generator it must be a clean and shiny connection to ground through its mount.
It should be good to go. Jim

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