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Old 06-17-2010, 08:57 PM   #1
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no ac from generator

Hi, we own a 38' gulfstream crescendo with a generac generator. When the generator is turned on there is no AC power. Can someone help get some answers? Thanks

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Old 06-17-2010, 09:08 PM   #2
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Check the breakers on the gen. or check the transfer switch...some of them have a time delay circuit that often fails. Mine has a little green light on the board inside the transfer switch. If the light isn't lighted then the time delay portion is bad. If this is the case there is also a small dip switch on that small board that can be switched off and there will be no time delay but the transfer switch will still work.

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8.1 Workhorse w/UltraPower,Taylor 409 plug wires,AC Delco 41-993 Plugs and OEM Engineering Fuel Filter Adaper
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Old 06-19-2010, 10:47 AM   #3
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Yep, check the breakers on the genset. Then check the breakers on your Inverter. If still no juice, tap the auto transfer switch box with a hammer to see if it was stuck.

If none of those items work, you could have a problem with the AC generation part of the genset. Take it to a shop that specializes in generator repair.
1995 CC Magna #5280
C8.3L 300hp Cummins, 31,000lbs
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Old 06-22-2010, 09:10 AM   #4
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Originally Posted by carsonevy View Post
Hi, we own a 38' gulfstream crescendo with a generac generator. When the generator is turned on there is no AC power. Can someone help get some answers? Thanks
THANKS EVERYONE! We tried all your suggestions and no good results. Will have to bring it in to a shop on our next stop.
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Old 06-22-2010, 09:36 AM   #5
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has it ever worked with the genset before?
on my coachmen there is a switch in a closet that i switch for genset or shore power. not sure if you have on but its worth a shot.
Mike,Deb and our 3 awesome dogs/ Rosie and Bear the pitbulls and Sassy the boston Terrier while Cheyenne is always in our hearts
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Old 06-25-2010, 01:41 PM   #6
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Make sure you dont have an outlet in the electrical cord storage compartment. We had the same problem and had to plug into the outlet in that storage compartment to get power to the coach for the AC.
Mel & Tammy - West Chester, OH
1996 Itasca Sunrise 25RC
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Old 06-25-2010, 02:10 PM   #7
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FWIW stubeje gave you the correct advice. Unless you are not handy at all as a DIY person take the cover off the transfer case and look at the Time Delay printed circuit board (PCB).
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Old 06-30-2010, 10:28 AM   #8
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I'm a bit late on replying so hopefully you already fixed.

On our Gulfstream, the gen was not supplying power to the coach. On opening the transfer switch and carefully using a meter I was getting 50 to 70 volts and the Hz were crazy.
I noted that insufficient power will prevent the transfer switch from closing, so the coach saw no voltage - only the cable from the gen to the TS contacts showed voltage.

I purchased the service manual online thinking it may be the governor as many said that would cause this problem. My other option was to see where the voltage regulator board was and maybe replace that.

Anyway, it turns out that the plug wire on one of the two cylinders was loose. All I did to fix it was put the plug wire on. The RMS's became steady, the governor stopped "hunting", and the output was right on.

Good luck.
John and Caren, Arkansas. 2006 Newmar Cypress 5th wheel. "Fractured Fairy tails"
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Old 10-29-2010, 10:31 AM   #9
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Hi, I own a 2004 gulfstream crescendo with a 330 cat engine on a freightliner chasis. We traveled cross country from NC to CA September 27-October 18. Just as we entered California via interstate 8 at the 1000 ft mark elavation the engine temperature indicator started to rise and about 2000ft. elevation the check info light came on as it reached the maximum high level. I then pulled off the highway to a safe area, left the engine running and turned on the coach heater to maximum high temperature. We unhooked the tow vehicle we were towing, and left the heater running until we descended to normal level. The temperature gauge stayed between 3/4 to max high. We started our next trip and again as we started to ascend to 1000 ft level the gauge started to indicate that the engine temperature is reaching its maximum temp. Can someone tell us what might be the problem and solution? Thanks for your help.
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Old 10-29-2010, 06:43 PM   #10
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Hi carsonevy,
It may be best if you began a new topic with your concern. It was luck that I saw your post in this thread that is on a different topic. Try the simple and cheap things first.

Check the coolant level. This cold be in the expansion tank and/or the radiator.

Check the radiator for being clogged. Blow air through the radiator in the opposite direction the air normally moves. This will take quite come time.
Make sure you do the bottom 1/3 of the radiator.

Take a long pipe cleaner and see if you can move it through the entire radiator depth. Start at the bottom. This is where most clogging will take place.

If the coach has a coolant filter, replace it.

If the coolant is full and the radiator is not or no longer clogged, try driving the coach. If the problem persists, it may be time for the pros to determine the cause.
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Old 10-30-2010, 09:55 AM   #11
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Start a new Thread to get more people to respond. I too found this by accident.

Is the coolant filled to max?

The elevation may not be a problem, but the % grade of changing elevation may cause overheating. Did you shift the transmission to a lower gear maintaining about 2000 rpm while climbing the grade. Or did the engine lug up the hill causing overheating.

If a rear radiator, has it been cleaned with Dawn Soap or Simple Green in the last year on the engine side. Oil dripping from the slobber tube gets blown onto the rear radiator which then accumulates gunk limiting the air pass through cooling capability.

Has the thermostat been replaced recently? It may be sticking closed if old.

If you have an infrared thermometer, you could attempt to check your water temperature gauge accuracy by shooting the radiator hose to get a comparable temp.

1995 CC Magna #5280
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