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Starter/Generator Voltage Regulator wiring

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I am trying to connect a new voltage regulator to a starter generator.

I have looked at every thread on Red Square dealing with S/G VR's as well as diagrams on the net.

My regulator has 4 terminals.

F-  Connects to the Field on the S/G

G- Connects to the A on the S/G

L- Lights or accessories

B- Battery

 

On the A terminal of the S/G the "start" wire should be connected either from a heavy duty switch or solenoid.

 

Now comes my dilemma....The G terminal on the VR is also grounded to the VR mounting, thus grounded to the S/G and the frame and finally the negative side of the battery. 

It appears to me that there will be a "dead short" when activating the "start" mode. Positive to the A post that is also wired to the G on the VR, thus ground.

 

Am I missing something or is my VR not right? The VR says "for positive OR negative ground". I am dealing with negative ground.

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I'd look in an older Kohler K-series service manual, electrical section. It shows the wiring for a starter generator setup.

 

image.png.651aebd7bf08de843608baeb93a6e741.png

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5a0e3606f3f0b_Startergeneratorwiring.jpg.768bfd24ff27c9d14e65a97d05cbd06c.jpg

Older Wheel Horse wiring diagram seems to match up with Bob's post from Kohler.

5a0e37cf8dbe5_953wiring.JPG.12632c15f3c7ccde8c5b5e5b4e04b7ab.JPG

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Does your new regulator have another terminal on the bottom?  Possibly the A terminal.

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48 minutes ago, 953 nut said:

Take a look at this.

5a0e35d358083_1ampmeter.jpg.fef6aba4848f68a6dca12b55afb31f53.jpg

 

48 minutes ago, rmaynard said:

I'd look in an older Kohler K-series service manual, electrical section. It shows the wiring for a starter generator setup.

 

image.png.651aebd7bf08de843608baeb93a6e741.png

 

16 minutes ago, ol550 said:

Does your new regulator have another terminal on the bottom?  Possibly the A terminal.

Fellows. I have looked at everyone of these diagrams multiple times.

The 4th terminal on the bottom of the VR has a "G" on it and it goes to the "A" post on the S/G....as does the start wire. The issue I see is a circuit from the positive side of the battery through the solenoid to the starter feeding + voltage to the G terminal that is grounded causing a dead short. 

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Is the "G" terminal actually grounded or is it just labeled "G"?

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This is the VR on my 854.

KIMG0314.jpg.12c58bd4a844cb2515a91a2a5f85bc0d.jpg

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Found this wonderful drawing. The "G" terminal is GENERATOR!

Image result for starter/generator voltage regulator

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7 hours ago, 953 nut said:

Is the "G" terminal actually grounded or is it just labeled "G"?

It is labeled "G" (for generator), but when I did a continuity test, it was grounded.

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Most likely a high impedance ground through the windings in the generator. Can you measure real low ohms? It may give you 1 or 2 ohms where a chassis ground will give you 0 ohms.

 

Garry

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2 hours ago, gwest_ca said:

Most likely a high impedance ground through the windings in the generator. Can you measure real low ohms? It may give you 1 or 2 ohms where a chassis ground will give you 0 ohms.

 

Garry

This may be what I am seeing.

I did speak with a mechanic at a tractor dealership this morning. I showed him the wiring diagrams and explained what I was talking about.

As he looked at the diagram, he said it was a "standard" diagram for s S/G VR setup and it will work if the S/G and VR are all working properly.

I do have to polarize the VR before I attempt the start the engine.

 

I know all electrical items work/operate on SMOKE, and if the smoke comes out, they are shot!!!:ROTF:

Thanks to all that responded and tried to help me understand what I had and was dealing with!

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