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Old 07-03-2012, 07:31 PM   #1
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New Diplomat owner with Gen issue?

I purchased a 2000 Diplomat 2 weeks ago and everything worked great and
we tested everything. When we picked up the unit and drove it home last weekend, we could not get the a/c to work with the generator running. I called the seller and did what she told me to do, with no luck.
Reading on the forum, I decided to check the ATS with a meter. With the
7.5 diesel Onan running, their is no voltage at the input side of the ATS switch. The breaker on the gen is on, and the light is on when running, and
the motor sounds great......but no power to the ATS.

Is there anything else I should look at?, or is it time to head to Cummin and
get the gen checked? and hope it is a inexpensive repair

Thanks,
Russ
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Old 07-03-2012, 08:07 PM   #2
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I have the same year Diplomat also, and I once encountered something similar. My problem was that the "salesman" switch was off, and with that switch off, the thermostat will not operate.

With generator running, do you have power at any of the outlets? If you do, the generator is providing power. You can also check to see if the lights are on the microwave display.

The salesman which is located just to the left when you walk in the front door, just tap the button once,
and see if the thermostat comes on.

I just bought my diplomat last fall, and have already put on 10,000 miles, and I love it.

Good luck.
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Old 07-03-2012, 08:23 PM   #3
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I get no power in the coach at all ,and the micro does not light up
(with the inverter off ) I will look at the switch tomorrow. What is it labeled?

Thanks,
Russ



Quote:
Originally Posted by 00MonDip View Post
I have the same year Diplomat also, and I once encountered something similar. My problem was that the "salesman" switch was off, and with that switch off, the thermostat will not operate.

With generator running, do you have power at any of the outlets? If you do, the generator is providing power. You can also check to see if the lights are on the microwave display.

The salesman which is located just to the left when you walk in the front door, just tap the button once,
and see if the thermostat comes on.

I just bought my diplomat last fall, and have already put on 10,000 miles, and I love it.

Good luck.
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Old 07-03-2012, 09:18 PM   #4
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Your genset has a AC (alternating current) breaker located on it. With no AC power to the transfer switch, surely this breaker is tripped.
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Old 07-03-2012, 10:12 PM   #5
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Quote:
Originally Posted by Robi.1014 View Post
Your genset has a AC (alternating current) breaker located on it. With no AC power to the transfer switch, surely this breaker is tripped.

The breaker is on and did not trip.

Thanks,
Russ
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Old 07-04-2012, 12:56 AM   #6
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RMFUN.....Take a rubber ended hammer or large rubber ended screw driver and give the ATS a whack and see what happens.
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Old 07-04-2012, 05:52 AM   #7
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Quote:
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RMFUN.....Take a rubber ended hammer or large rubber ended screw driver and give the ATS a whack and see what happens.
I kinda tried that as first. I took the cover off the ATS and the LED light was not on, showing a delay issue or no power tp the ATS.

Even if the ATS was bad, I would still read 120V on the input cable connection, correct ? That would mean that the Gen is not putting out any power, correct?

Thanks,
Russ
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Old 07-04-2012, 07:00 AM   #8
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Quote:
Originally Posted by RMFUN View Post
I kinda tried that as first. I took the cover off the ATS and the LED light was not on, showing a delay issue or no power tp the ATS.

Even if the ATS was bad, I would still read 120V on the input cable connection, correct ? That would mean that the Gen is not putting out any power, correct?

Thanks,
Russ
Maybe a brush or commutator problem with the generator. You did throw the breaker on and off a few times? If you just purchased this coach and it has been setting for some time, you may have some corroded electrical connections inside the generator. You can find the manuals on line in pdf format if you don't have one.

Bob
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Old 07-04-2012, 02:10 PM   #9
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Quote:
Originally Posted by nodine View Post
Maybe a brush or commutator problem with the generator. You did throw the breaker on and off a few times? If you just purchased this coach and it has been setting for some time, you may have some corroded electrical connections inside the generator. You can find the manuals on line in pdf format if you don't have one.

Bob
Thanks, I will try that also. Yes the RV sat for over a year and I would hope
the owners exercised the Gen.

Thanks,
Russ
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Old 07-04-2012, 07:19 PM   #10
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I would pull the cover at the breaker on the genny and check the voltage on both sides of that breaker. The genny produces 220 V and the breaker is a double pole breaker. If no voltage at the supply side of the breaker, then it is a control problem inside the genny case.

Good luck
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Old 07-04-2012, 08:36 PM   #11
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Originally Posted by ruffian View Post
I would pull the cover at the breaker on the genny and check the voltage on both sides of that breaker. The genny produces 220 V and the breaker is a double pole breaker. If no voltage at the supply side of the breaker, then it is a control problem inside the genny case.

Good luck
I will give this a try. I thought the generator put out 120v, Isn't that what
the coach uses and what the shore power is?

Thanks,
Russ
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Old 07-04-2012, 09:39 PM   #12
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Quote:
Originally Posted by ruffian View Post
I would pull the cover at the breaker on the genny and check the voltage on both sides of that breaker. The genny produces 220 V and the breaker is a double pole breaker. If no voltage at the supply side of the breaker, then it is a control problem inside the genny case.

Good luck
No 220v on the 7500 onan that I am aware of. You have to go to the 10kw to get 220v.
http://www.poweredgenerators.com/ona...als/a-1408.pdf
http://www.poweredgenerators.com/ona...als/a-1483.pdf

Did you check everything while hooked up to shore power? If you had the generator running while hooked up to shore power, I believe the generator has priority over shore power but if something was already wrong with the generator, then shore power would take over and make you think that the generator was operating properly. I would take a good look at all grounds as maybe something jarred loose on your trip home. If you can't find anything and there is no power going to the ats, then it is probably time to take it to cummins.
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Old 07-04-2012, 10:31 PM   #13
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Quote:
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No 220v on the 7500 onan that I am aware of. You have to go to the 10kw to get 220v.
http://www.poweredgenerators.com/ona...als/a-1408.pdf
http://www.poweredgenerators.com/ona...als/a-1483.pdf

Did you check everything while hooked up to shore power? If you had the generator running while hooked up to shore power, I believe the generator has priority over shore power but if something was already wrong with the generator, then shore power would take over and make you think that the generator was operating properly. I would take a good look at all grounds as maybe something jarred loose on your trip home. If you can't find anything and there is no power going to the ats, then it is probably time to take it to cummins.
With shore power, everything works fine.

Thanks,
Russ
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Old 07-05-2012, 08:04 AM   #14
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Quote:
Originally Posted by RMFUN View Post
With shore power, everything works fine.

Thanks,
Russ
Russ, let me re-phrase what I was asking. When you first got the coach and said you tried it out and everything worked....were you hooked up to shore power when you tried everything out including the generator running while hooked up to shore power?

Reason I ask this:
1. if hooked up to shore power while generator is running: generator would have priority over shore power.
2. but...if generator was not putting out any power, then shore power would have taken over and made you think the generator was working properly.
3. To insure generator was putting out power, you would have to un-hook from shore power.
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