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Old 07-11-2020, 05:37 PM   #21
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Originally Posted by Martinez View Post
Great post as I've had the same issues. Why do you have to have something running when you are exercising the genny though?
To heat up and drive moisture from the generator windings.
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Old 07-13-2020, 01:36 AM   #22
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Originally Posted by gmc View Post
While you may have the voltage, the house batteries may be failing under load.

With engine running, the chassis and house batteries are joined, and alternator supplying power.

Hold down the emergency start switch and try starting the genny... if that works, I would suspect house batteries unable to handle load.

GMC,
Good suggestion, but again no joy on my part.
When holding the emergency start and trying to start the genny, I get nothing. I have tried to start the genny from the monitor panel and from the cab dashboard, but get only crickets.


Is there a switch or "mode" I should place the generator in when I want to operate off-the-grid?


Thanks again for your input.


Rxster08
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Old 07-13-2020, 02:00 AM   #23
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THOR #7035
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GMC,
Good suggestion, but again no joy on my part.
When holding the emergency start and trying to start the genny, I get nothing. I have tried to start the genny from the monitor panel and from the cab dashboard, but get only crickets.


Is there a switch or "mode" I should place the generator in when I want to operate off-the-grid?


Thanks again for your input.


Rxster08

OK, time to do some wire tracing. I suspect you have a tripped 100 amp DC breaker that should be wired directly to the positive side of your house batteries. On the load side of that breaker will be the starting circuit for the generator and the cross-connect device to tie the house and chassis batteries together.

The breaker, when tripped, has a red or yellow flag popped out sideways. Push it back in to reset it.

The reason it works when the engine is running is because the alternator output has triggered the cross-connect relay and is supplying 12+ VDC to the generator's starting circuit.

The reason it doesn't work when using the emergency start switch is because the switch gets its activating voltage from the house side of the cross-connect relay, which, of course, is dead with the breaker tripped.

This is assuming everything is wired normally - it may not be with a used coach. Find and check that DC breaker!
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Old 07-13-2020, 12:58 PM   #24
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Brand: Thor Motor Coach
Model: Axis 25.5
State: Florida
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THOR #19095
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Originally Posted by 16ACE27 View Post
OK, time to do some wire tracing. I suspect you have a tripped 100 amp DC breaker that should be wired directly to the positive side of your house batteries. On the load side of that breaker will be the starting circuit for the generator and the cross-connect device to tie the house and chassis batteries together.

The breaker, when tripped, has a red or yellow flag popped out sideways. Push it back in to reset it.

The reason it works when the engine is running is because the alternator output has triggered the cross-connect relay and is supplying 12+ VDC to the generator's starting circuit.

The reason it doesn't work when using the emergency start switch is because the switch gets its activating voltage from the house side of the cross-connect relay, which, of course, is dead with the breaker tripped.

This is assuming everything is wired normally - it may not be with a used coach. Find and check that DC breaker!

Ted,
I tip my hat in your general direction and I owe you a beverage or two.

Thank you for your efficient diagnosis, I found the breaker with the yellow flag out. Reset the breaker, hit the start button and genny started right up.


Thanks again,


Rick
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Old 07-13-2020, 02:11 PM   #25
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THOR #7035
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Originally Posted by Rxster08 View Post
Ted,
I tip my hat in your general direction and I owe you a beverage or two.

Thank you for your efficient diagnosis, I found the breaker with the yellow flag out. Reset the breaker, hit the start button and genny started right up.


Thanks again,


Rick
Glad to help!
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