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Old 05-12-2010, 07:19 AM   #1
98 33' Beach House
1998 33' Land Yacht
Beaufort , South Carolina
Join Date: Jan 2006
Posts: 14
Onan running but no power to a/c....

I have a 98 LandYacht w/Onan Marquis 5000. I use the generator during trips up I-95 from SC to MD in the warmer months to run the roof a/c, cofee maker, microwave. The gen has 315 hrs. total and has performed flawlessly during the past 5 years.

So changed the oil today and fired it up but NO power to the appliances at all.

Is this is diode issue in the generator or have I tripped a fuse somewhere?

BTW, all appliances work well when plugged to shore power.

Chip in Beaufort, SC

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Old 05-12-2010, 08:20 AM   #2
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2010 28' Flying Cloud
Escondido , California
Join Date: Feb 2007
Posts: 193
Check the ckt-bkr on the generator

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Old 05-12-2010, 08:45 AM   #3
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Las Vegas , Nevada
Join Date: Apr 2007
Posts: 601
On our 345 MH the Onan has two ckt-breakers and one in-line glass fuse right at the gen. and they would be the first things to check, especially since yours is ok on shore power. Yours should be similar.
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Old 05-12-2010, 09:05 AM   #4
98 33' Beach House
1998 33' Land Yacht
Beaufort , South Carolina
Join Date: Jan 2006
Posts: 14
yep. but no.

Found those already. Still no power.?

Also, pulled out my Onan Manuel and now have a much better idea of how things are 'supposed to' work (along with wiring diagram).

My LY has two model TS-30 power switchs that control the transfer from gen to house pwr. I'll be testing those today.

I've heard that the problem can be the diodes in the gen itself. Lots of big boats here in Beaufort w/these Onans and some have needed their diodes renewed.

I'm hoping not.
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Old 09-06-2010, 08:29 PM   #5
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1995 30' Cutter Bus LE
Madison , South Dakota
Join Date: Nov 2008
Posts: 242
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Did you figure out what went wrong? My gen just started diong the same thing. Runs but no power out.
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