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Old 11-23-2020, 03:50 PM   #1
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Generator won't power Rv

When I fire up the Rv generator, it doesn't consistently power up the rv electric. We rarely use the generator. When I start the generator, it is inconsistent at providing power to the rv. Many times the generator is running and the rv has no power. Am I safe to assume it is my transfer switch? Thank you.
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Old 11-23-2020, 04:12 PM   #2
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Without testing ; not really .
A bad circuit breaker on the gen set , problems internally issues with control board or brush contacts are possible .

My gen set will run ; after start up for 1>2 mins depending on temp . before the rpm stabilizes and power is sent to the transfer switch , all part of the program.

Do you have a manual for the gen set , they usually have trouble shooting section .
No manual , then post your; make and model info, and we can try and track one down .
Also any info you've got on your transfer switch , and we can look into testing there too.
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Old 11-23-2020, 04:20 PM   #3
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I'll find the information out. I know it is a Generac Generator. I'll look it up. Thanks.
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Old 11-23-2020, 04:25 PM   #4
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• 7,500-watt Generac Guardian Generator with Remote Switch
and Automatic Changeover

Not sure if that helps. Thanks for helping.
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Old 11-23-2020, 05:11 PM   #5
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I'll see what I can dig up for a manual .

Now; do you know where your auto transfer switch is ?
Do you have a multi-meter ?
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Old 11-23-2020, 05:26 PM   #6
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TS should be close to inverter, follow the noise when plugging into shore power.
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Old 11-23-2020, 05:38 PM   #7
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When we had a generac we would have the same problem. It was the transfer switch. I would have to go in and clean the contacts in the TS and then worked fine. When you go into transfer make sure you are not plug into shore power or genny running. A finger nail file works really well for cleaning contacts. Best of luck. Our TS was under bed.
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Old 11-23-2020, 05:48 PM   #8
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My friend had a generac that was putting out only about 105 volts. We found it had an adjustment Screw on the board that allowed us to get the voltage back to normal. I would first check the voltage coming out of it as that can cause the symptoms you have. It was an easy fix and stayed that way.
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Old 11-23-2020, 05:59 PM   #9
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You need to use a voltmeter and with care of course.

Connections inside the transfer panel should be checked at least once a year.
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Old 11-23-2020, 06:34 PM   #10
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I have a Generac gas rv gen diagnostic/repair manual (pdf). If someone could help me figure out how to post that here, I would be more than happy to. For some reason I am having trouble.
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Old 11-23-2020, 06:43 PM   #11
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Hi, I recently camped next a class c camper and the owner ask me the same question. He said he had checked everything, ask him to check the wires that came into his main fuse box, he did and some were not quite tight we tightened { with a screwdriver) and he had power. I have seen that on a couple more motor homes, especially new ones. charlie in texas
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Old 11-23-2020, 07:10 PM   #12
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We have the Generac Generator. We use it a lot. Last month on a trip we had stayed all night in a truck stop parking lot with generator running. the next morning everything was working great, I was running a small electric heater. I turned on the block heater for the engine, then my wife started to make coffee and we lost power. Turned off some things and power came back. Found it to be the drive belt powering the alternator. Our MH is an 05 model and this is the 2nd time we have had to replace the drive belt. I think Generac recommends to replace the belt ever 1000 hours. We had like 1205 hours on the belt. When I removed the old drive belt it was really worn out. We have put about 60 hours on it since the replacement and it is working great.
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Old 11-23-2020, 07:22 PM   #13
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Check your plugs and air filter on the gen. It the rpms are off, it will not send power out. I have had mine sound fine and seem to run fine without sending power but loosened the air filter and got power when the engine sped up just a little.
Mine also has LED on the module that lights up bright. I had no output one time and the LED lit up, but dimly. In that instance I had to replace the board for around $130.
I have a 2002 Generac Prime pact 66lp.
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Old 11-23-2020, 08:18 PM   #14
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Most of the time at our shop we found it was the transfer switch. There is a delay timer in the TS that allows the generator to stabilize before closing the contacts. This switch will get worn and not always close. It is easy to check. Just open the transfer switch. Start the generator and check for power incoming from the generator. If no power, it is the generator. If there is power coming into the switch but not closing, it is the delay timer. If the switch is closing but no power going through the contacts it is the transfer switch.
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