860 - No longer charging - what could it be?

Jeff Hamilton · Oct 21, 2021

6 volt system. Replacing the voltage regulator (new YT version) and polarizing got my system charging, I mean really charging. Ammeter pegged (30+A) at 600 RPM and up. At 500 RPM it was charging 15 amps. If I turned on the lights it dropped 15 amps. Brand new, fully charged battery (confirmed). Ran it around for 15 minutes with meter pegged. Using infrared gauge, generator temp was 145F at the front and 168F at the rear. VR was 128F. Seemed too hot?? Oil filer was 181F. Next day, after 10 minutes, it quit charging completely. Generator 100F and VR was 80F. Something broke, any ideas? Oh, and I have the books. Lots of diagnosing instructions in the manuals, but I'm hoping someone can advise from similar experience. thanks

Bern · Oct 21, 2021

Defective VR. Charging rate should slowly drop down towards zero as it's running, not stay pegged. Keep this up and you'll damage the battery and burn out bulbs.

Dean · Oct 21, 2021

What Bern said.

Sounds like it's full fielded. This can be caused by stuck contacts in the VR or incorrect wiring.

The good news: It sounds like your generator is OK (or at least was).

Dean

JMOR · Oct 21, 2021

(quoted from post at 08:07:21 10/21/21) 6 volt system. Replacing the voltage regulator (new YT version) and polarizing got my system charging, I mean really charging. Ammeter pegged (30+A) at 600 RPM and up. At 500 RPM it was charging 15 amps. If I turned on the lights it dropped 15 amps. Brand new, fully charged battery (confirmed). Ran it around for 15 minutes with meter pegged. Using infrared gauge, generator temp was 145F at the front and 168F at the rear. VR was 128F. Seemed too hot?? Oil filer was 181F. Next day, after 10 minutes, it quit charging completely. Generator 100F and VR was 80F. Something broke, any ideas? Oh, and I have the books. Lots of diagnosing instructions in the manuals, but I'm hoping someone can advise from similar experience. thanks

id you polarize generator while connected to VR and by applying battery voltage to the field?

Jeff Hamilton · Oct 23, 2021

JMOR - sorry took so long to reply and I really appreciate your interest. How did I polarize? With everything hooked up I started at the regulator. I unhooked the wire attached to the FLD terminal and then for about one second I touched it to the BAT terminal. I saw a little spark. I reattached the wire and started the tractor. It was now charging, but maxed out. I sketched up how I'm wired up. See below. Please advise if it looks wrong. To others who might see this post later on you might not want to hang your hat on this wiring diagram!Thanks, Jeff

JMOR · Oct 23, 2021

(quoted from post at 10:54:02 10/23/21) JMOR - sorry took so long to reply and I really appreciate your interest. How did I polarize? With everything hooked up I started at the regulator. I unhooked the wire attached to the FLD terminal and then for about one second I touched it to the BAT terminal. I saw a little spark. I reattached the wire and started the tractor. It was now charging, but maxed out. I sketched up how I'm wired up. See below. Please advise if it looks wrong. To others who might see this post later on you might not want to hang your hat on this wiring diagram!Thanks, Jeff
<img src=https://www.yesterdaystractors.com/cvphotos/cvphoto105596.jpg>

ooks good to me and sounds like correct polarization method. I would jumper Field to ARM then start tractor and jumper BATT to ARM and if charging at this point I would call good gen & bad VR.

860 - No longer charging - what could it be?

Jeff Hamilton

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Bern

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Dean

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JMOR

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Jeff Hamilton

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JMOR

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