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Ask Hank F. Your Own Question
Hank F.
Hank F., RV tech - emphasis on gensets
Category: RV
Satisfied Customers: 14918
Experience:  RV tech since the beginning of the millenium.
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Onan 7000 marquis in a 2000 coachmen class A. Shoreline

Customer Question

Onan 7000 marquis in a 2000 coachmen class A. Shoreline works fine. Installed a new brush assembly. I have 130v on output side of both breakers, also at junction box and auto transfer switch. I have no voltage on feed side of breaker box inside coach, not even 110v for plugs. Transfer switch was replaced last year....??
Submitted: 1 year ago.
Category: RV
Expert:  Hank F. replied 1 year ago.
Thank you for requestig me.
What is the full model number of the genset?
Let me get this straight - you say the genset is producing power, and the power is getting through the first junction box, and into the transfer switch, but is not getting to the main breaker panel in the coach?
Is this a 30A or 50A TS?
Customer: replied 1 year ago.
Marquis 7000 7nhmfa26105h. 50 amp. Shouldnt i also see 220 across when measuring both hot leads?
Customer: replied 1 year ago.
no power in coach but both leads going into transfer switch reading 129-130v
Expert:  Hank F. replied 1 year ago.
This genset is rated for 120V only - you will not get 240V across the hot legs.
This sounds like your TS has gone bad again.
There will be 3 cables into the TS - an input from the genset, an input from the shore cord, and the output to the coach.
Determine which cable is which.
With the coach unplugged, start the genset, and immediately go to the TS.
Wait for the timer to expire and the TS to change over, usually 30 - 45 seconds.
Once the TS has switched over, test the output leads to see if you have voltage there.
If the TS does not switch over, there is a problem in the TS control.
If it swtiches over, but there is no output, the contactor is bad.
If there is output from the TS, you have a broken wire between the TS and breaker box, or something is miswired at the breaker box.
Expert:  Hank F. replied 1 year ago.
Did you find the problem?