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I agree. Slim chance the VRs are bad. I've checked, cleaned, bonded and tightened the wiring between the VR-Batt-Dyno. I don't have a real schematic so I'd have to physically follow each wire to be sure where it goes. With the VR output unplugged I get 11.9V. Plugged in I get battery voltage...

I'm on my 3rd. No change with any of them. Thanks anyway.

I know how but not going to on all wiring. Have to rip it entirely apart. I did pull the wire from the vr and with no load it was putting out 11.9 volts. And I did remeasure the dyno - 13.3 idle 30 full rpm. Not sure how I got 20 before but no worries. I hesitate to start throwing parts at it as...

More tests. Dynamo reads the same 13/30VAC idle/full with all three VRs . Battery at 12.9V before starting. After start 12.4 while running with any VR and with engine shut down but key on with any VRs With key off batt voltage climbs slightly to 12.7.

And FYI. Since the wiring diagram for the unit is top secret I took the base Kubota diagram and made as many changes to match the equip. But w/o a diagram I can't correct all.

This morning I checked the dyno output at idle and full rpm, no load and hooked to VR. Load or no load volts were the same this time. 13.2 vac no load to 30 vac w/load. Now this is with the warranty replacement VR. Not sure why last time with a load was 20v at max rpm with load but this is first...

I checked with a meter, replaced the wire and grounded the VR case. Nothing seemed to matter.

Mananna. Too cold at present. As I recall it was 20VAC connected but don't recall unloaded. I'll top the battery and run after the garage is warmed up. This is new BTW and supposedly under warranty so I am waiting for a reply from China but they produce a vacuum so not holding my breath. The VR...

My apologies. I can tell you the voltage but it varies with RPM. What would you like? Full and disconnected or connected?

See original post for info. PN is RP201-53170. Different with different manufacturers.

Did that connected and disconnected. Both readings were within the spec. Like I mentioned I even swapped the leads just for fun. Unfortunately I only have a partial wiring diagram. This is a (DELETE) chinese with a Kubota D722 and they won't release any info as it is "top secret". Which is funny...

One item that may have been missed above. If I pull the wire from the VR connector that goes to the battery, the charging output, it reads 11.9V with no load. Hooked up reads battery voltage. This would/should eliminate anything drawing the voltage down from excessive load. But I am not sure...

Depends on RPM and load. Connected and at full RPM output is 20VAC as per the spec. Swapped leads just for... no change New battery no change. Nothing but the fuel pump and SOV. Glow plugs are a big drain but they cut off after start. Replaced battery, no change.

Bought a new battery. No change. Fully charged drained down to 12.25 while running at full throttle. Polarity correct.

#1 is next step. It's 16 bolts to remove battery #2 done but no diff on short run. #3 32F #4 not done yet but voltage is the same everywhere #5 not loose.

3 new voltage regulators; original, one warranty and one acquired independently. All three VR outputs are 11.9 volts with no load; battery voltage when connected. Checked at max RPM. Confirmed AC volts per spec from dynamo. Swapped dynamo leads. Confirmed ground with meter and replaced ground...