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Old 08-20-2012, 07:56 PM   #1
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Join Date: Feb 2012
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Total loss of power after startup

Does anyone know if a malfunctioning BiDirectional Isolator Relay Delay will cause the motorhome to lose all power when generator attempts to take over the coach power? This problem is intermittent and has got me baffled.

I started the motorhome up from a cold start and after a few minutes I cranked up the generator for it's monthly cycling. When the generator got up to speed and attempted to take over powering the coach the entire power system shut down. The coach was dead electrically. The only thing that functioned was the power step.

I measured power out of the continuous duty solenoid and discovered one side was 12v and the other measured 5 - 7v. After waiting a couple of minutes I measured the voltage again on the solenoid and found 12v out of both sides. I was able to start the coach and ran it up to operating temp. Started up the generator and cycled all electrical systems with no other issues.

Is there a troubleshooting procedure anyone would be willing to share to isolate this phantom and fix it so I won't worry about the sudden loss of power going down the road?

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Old 08-21-2012, 07:50 PM   #2
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Join Date: Jan 2000
Location: Silver Springs, FL. USA
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The only relationship between the isolator and the generator is that both need 12v to operate. It sounds as though starting the generator dropped the battery voltage enough so that the you lost all 12v power and it didn't recover until the generator had run awhile, thus powering the charging system.
Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is in the Ocala Nat'l Forest near Ocala, FL
Summers in Black Mountain, NC
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