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Old 08-20-2013, 03:58 PM   #21
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when taking an RV to shop, either RV Dealer, Cummins, Freightliner etc. not only tell them what's wrong, show them! when picking up try what ever was going wrong, sometimes more than once to make sure it's fixed. Denny, recommend you take it back and do what you did at home so they really know the problem. Did they charge you anything, I hope not for a new unit.
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Old 08-20-2013, 04:08 PM   #22
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My #3051S has the converter/charger in the shoreline cord compartment. There are two 35 amp fuses on it. Also, I just ran my generator for one hour with full load and a/c running my inside plugin volt meter indicated 115 volts the entire time. Remember your house battery switch needs to be ON for them to charge!
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Old 08-20-2013, 04:11 PM   #23
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While in the shop ask them to make sure its running on both cylinders, I am assuming its a 2 cylinder Onan. In one of your post you mentioned its running better. I am getting the impression that its not running quite right. There are time these 2 cylinder Onans may quit firing on one cylinder and not really notice it until a situation where on a full load it stalls out.
Do you have a plug in electric heater or 2? If only one heater put some water in a bowl and run the microwave while running a heater. You need to get the genny loaded down with something other than the a/c to prove the genny is the issue.
Do you know how many watts the micro is?
We need to get close to the max rating of the genny. Lets say you have 2 heaters, on high they will pull about 1500-1800 watts each depending on the brand, that would load up the genny pretty well.

One heater and a big blow dryer would be about the same.

Use plugs in the rig from different circuits or you will trip a breaker.
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Old 08-20-2013, 04:13 PM   #24
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Beginning to sound like a Governor speed/load device. Voltage regulator only functions for keeping a voltage set point, if the governor can't see and respond to a large load change, the unit will stall or overspeed and trip on RPM. Your dealer may have incremented a large load change, but without a sudden dramatic change like a A/C under load instantly, its going down for the count if its defective.
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Old 08-20-2013, 04:18 PM   #25
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Originally Posted by VinceU View Post
Beginning to sound like a Governor speed/load device. Voltage regulator only functions for keeping a voltage set point, if the governor can't see and respond to a large load change, the unit will stall or overspeed and trip on RPM. Your dealer may have incremented a large load change, but without a sudden dramatic change like a A/C under load instantly, its going down for the count if its defective.
This was going to be my next point.

If the genny runs a full load gradually put on, now with everything running, turn off the main breaker, then turn it back on. This would be putting a full load on at one time and see how the genny responds.
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Old 08-21-2013, 08:04 AM   #26
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This model Onan is a single cyl. 4000 Watt gen. Everything, including A/C runs fine on shore power. On generator only power the A/C fan will run, the Microwave will run but the 2 together shuts the gen down. The A/C compressor coming on(only thing on) shuts the gen down. The A/C pulls 2.3 amps with fan and 14.1 when compressor kicks in.
Right now this is all I know.
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Old 08-21-2013, 08:32 AM   #27
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This model Onan is a single cyl. 4000 Watt gen. Everything, including A/C runs fine on shore power. On generator only power the A/C fan will run, the Microwave will run but the 2 together shuts the gen down. The A/C compressor coming on(only thing on) shuts the gen down. The A/C pulls 2.3 amps with fan and 14.1 when compressor kicks in.
Right now this is all I know.
Okay that ruled out a potential problem with the 2 cyl. issue.

I would still do the load test I suggested above to see if the generator can handle it or not. Being everything works good on shore power I still say it a genny issue. Doing some of your own troubleshooting gives you more info to give the repair facility.

Also what make and model is the a/c unit?
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Old 08-21-2013, 07:02 PM   #28
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The picture is getting a little clearer!! I replaced the 2 house batteries as they were dead! 11.93V tops. Installed 2 new batteries, plugged in just to top them off and then unplugged to start the gen. It would not turn over! Acted/sounded just like a dead battery in a car. Also batt lights on panel showed no lights. Plug back in and panel batt lights all light up. With MH engine running and of course unplugged from shore power the gen starts right up, but still quits when trying to start A/C. So...... sounds like a converter/charger issue. Goes to the RV Dealer on Friday.

Any thoughts??
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Old 08-21-2013, 07:54 PM   #29
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Quote:
Originally Posted by DennyH
The picture is getting a little clearer!! I replaced the 2 house batteries as they were dead! 11.93V tops. Installed 2 new batteries, plugged in just to top them off and then unplugged to start the gen. It would not turn over! Acted/sounded just like a dead battery in a car. Also batt lights on panel showed no lights. Plug back in and panel batt lights all light up. With MH engine running and of course unplugged from shore power the gen starts right up, but still quits when trying to start A/C. So...... sounds like a converter/charger issue. Goes to the RV Dealer on Friday.

Any thoughts??
Maybe...

Poor cable connections. Remove, wirebruh ends aand terninals, put back with elec grease.

Disconnect not working.

Improper wiring from battery change.
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Old 08-21-2013, 08:12 PM   #30
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Battery cables are connected correctly. Cable end clean. Not sure about disconnect, although without shore power and disconnect on, the 12 v systems work, ie lights etc.
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