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Old 03-10-2013, 03:48 PM   #1
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Generac NP-66G

Ran the generator today with everything AC switched off for some exercise and wasn't getting more than 5V at the output lugs. The regulator LED was out so I figured I needed to maybe replace it.

I shut it down and maybe 5 mins later, started it up again and the regulator LED was lit. Confirmed 110 VAC at the output. Ran it for about 5 mins and then shut it off. After another 5mins started it again and again the LED was out and no AC AGAIN. Repeated again and the LED was back on and pumping out AC. Repeated a couple more times and the LED was working just fine every time so I just let it run with the A/C on to put a load on it. No problem and ran for about 30mins. The generator has only 200hrs on it but it is a 1996.

I plan on running it again later this week to see if the problem comes back.

I think I might just order a voltage regulator to have it on hand for the day it does actually fail however, I am worried it may be something beyond the regulator. Has anyone had and intermittent voltage regulator problem? My search of the archives show only out and out failures.

Thanks in advance!
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Old 03-10-2013, 04:43 PM   #2
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Before buying a new regulator I'd check all wire connections and your transfer switch. There are lots of reasons electricity won't flow. Flip the circuit breakers on the generator on and off to clean contacts. Does your generator have an outlet on it to monitor AC directly at the source? Wire connections can loosen up and drive you nuts with an intermittent power interruption. Hook a meter up directly to the generator output and test it there.
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Old 03-10-2013, 05:42 PM   #3
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BFlinn181...thanks for the sanity check.

I check for voltage right at the generator side of the breakers to confirm it is working (or not working) with my DVM. The transfer switch shouldn't matter because that is down stream of the generator. I could see that if I had 110VAC at the generator and NOT in the coach then I would suspect transfer switch but that is not the case.

This truly was either generator providing power...or not...scenario. Not a loose connection. When the light on the regulator was off...no AC...when lit...110 VAC. It is behaving like an intermittent regulator but it could be a problem in the stator assembly as well as it is upstream of the regulator...just would surprise me to be intermittent if it was stator...usually a winding will melt and just short to ground...not intermittently though. That's why I suspect the regulator but have never heard (or found) one to act intermittently.
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Old 03-11-2013, 10:41 AM   #4
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Link to diagnostic repair manual

A little more internet searching today led me to the generac diagnostic repair manual

http://www.bdub.net/manuals/Generac_IM-NP-Q.pdf

I'm going to have to do some reading but I think this will help me find the source of the problem. Thought I would post he link for others' information.
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Old 03-18-2013, 01:00 PM   #5
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Just to let you know, I had the same problem with the led. Trouble shot the system and could not find a fault. Ran the generator again and led on and generator outputing correct voltage. I do suspect a failing/intermittant regulator. I did remove all the terminals from the regulator whilst trouble shooting so there is a possiblity of a dirty contact but....... I more inclined to think the regulator is the culprit.

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Old 03-18-2013, 02:04 PM   #6
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Thanks Martin. I did see your other thread. I haven't been able to go through the troubleshooting flow chart yet but mine is still acting up. Had to start the generator three times the other day until it finally started delivering AC power. I'm worried it is something other than the regulator but until I get a chance to look closer, I think I might just go ahead and order a new regualator anyway to have it on hand. It's only about $139
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Old 03-18-2013, 02:12 PM   #7
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I had the same problem on my QP65 and it turned out the field boost current is only applied while the start button is pushed. You can try holding the button a little longer to let the current build or install a field boost kit (0H07850SRV) which provides a current source independent of the start button being depressed. Have not had a problem with 120VAC coming up since the install.
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Old 03-19-2013, 10:13 AM   #8
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Thanks for the info on the field boost kit, I'll check it out. And yes that is correct with the field boost only being applied when the start button is depressed.

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Old 03-23-2013, 04:38 PM   #9
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Was able to determine today that mine is also having the field boost problem. When holding the start button down the LED is dimly lit. Holding it down for 3-5 seconds gets the LED to light fully. Does it every time.

I'm going to look into the field boost kit Tom17 suggested.
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Old 04-21-2013, 08:39 AM   #10
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Just installed the field boost uplift kit yesterday and now I get 120 VAC every time.

Thanks Tom17 for steering me on the right direction. I owe you one
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Old 04-22-2013, 07:20 PM   #11
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JRMEDPHYS - You're very welcome. Glad it worked for you.
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Old 05-20-2018, 03:43 PM   #12
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Generac np66g field boost kit

I know this is an old thread. I just now found it and the info seems to have solved my occasional problem of no AC at startup. The info about holding the start button for an extra second works for me.


Thanks for the info.
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