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Thanks for all the really good info. Even if I were to get the generator to produce 120V, with the auxiliary field windings open, there is no real way to control the voltage under changing loads. All that to say, it is time to pull the electrical end, get everything cleaned up and see if there...

One thing I didn't do was measure the resistance across F1 and F2. It was 1 million ohms (1020 on the 2000k scale). Does that mean there is a break in the line somewhere?

Well, at least I have learned quite a bit about how the electrical end of a generator works. Would the next step be to get 4 big magnets and put them around the case to set up a permanent magnetic field? Thanks. R/Greg

Here is the latest. I removed the A1 leads from the transformer and started the generator. It did the same thing. Voltage now peaks at around 20VAC then settled back to 2.5VAC. To re-verify the brushes and rotor, with the transformer out of the circuit, I backfed the generator with 110VAC for a...

Here is the latest. I removed the A1 leads from the transformer and started the generator. It did the same thing. Voltage now peaks at around 20VAC then settled back to 2.5VAC. To re-verify the brushes and rotor, with the transformer out of the circuit, I backfed the generator with 110VAC for a...

Hope you had a good Thanksgiving. Thank for the response. I did replace the selenium rectifier. No help. I'll bypass the regulator circuit and see what happens.

Thanks for all your help. It is greatly appreciated.

Thanks for the reply. It is the same generator. The engine runs fine. Oil pressure and temp sensors work. Motor trips after about 20 seconds because voltage has not come up to 110. I had to replace resistor R7 and the diode RE2 plus IR2. I cleaned all the connector bands. The resistance of R1 is...

I have a 1977 Kohler 10R0P23 generator that when it starts comes up to about 25VAC then goes right down to 2.5VAC and stays there. I have verified all the components I can see. The only component I don't know how to test is the transformer. Also where is the voltage regulator? The transformer...

Thanks

Got sidetracked with other boat jobs but have gotten back to the generator. The resistance of R1 is 3 ohms. Is that OK? Also checked the transformer/rectifier combination by disconnecting A1 from the generator and putting in a 120 VAC source. When I did that, I could hear 1CR trip and the power...

Thanks for the info from Smokestack. I read the selenium rectifier posts. Yes, could be a problem but I'm working in a well ventilated area, hatches open fans going.

Thanks for all the good advice. I'm being super careful. All the troubleshooting is being done cold iron. - I'm testing the generator with no load generator breaker open. - I'll relook at R1. The brushes have very little wear on the and make good contact with the rotor. The rings on the rotor...

Still troubleshooting Replaced Resistor R7. Went big with 25 watts. When I started the generator it went up to 7 volt a/c then settled down to 2.5V. Let it run for about 15 seconds. No change. Just on the off chance I tested the diode wrong, I jumped it, same thing. I'll make sure 1CR is...

Thanks for the input. I tested the diode with the multimeter and it passed.

Yes. The diagram you provided. All of the elements were the same. Also, I got a 30 ohm resister for R7 and will replace it this afternoon.

Appreciate the Assistance Thanks for all the great info. Unfortunately, there wasn't a wiring diagram on the inside of the controller housing. All I was able to find was the model, controller and serial number. I have attached two pictures of the controller from the top down. The nomenclature...

I have a 1976 DeFever trawler with an original Kohler 10kw Generator. Here are the specs: Model: 10ROP23 Controller: D-268923 Motor: Perkins 4.107 The engine starts and runs. Oil pressure and temp sensors work properly but do not have AC voltage. Generator sat for 7 years on the hard so I...