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11-13-2015, 10:05 AM
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#1
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Member
Join Date: May 2010
Location: New York
Posts: 63
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Very Strange Issue Onan 7500 Diesel generator
Generator stop running and when I test power into the unit I find 12v at the back of the unit. However there is no power at the lighted switch nor at any of the three fuses that I can access under the access panel. The weird thing is that this morning I put a test lamp of the fuses again and found power there, but before I could even try to start it the power mysteriously was gone and the test light no longer lights up? It is a 2004 unit with low hours and always worked well. Chassis batteries are pretty new.
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11-13-2015, 10:23 AM
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#2
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Senior Member
Winnebago Owners Club Ford Super Duty Owner
Join Date: Jul 2012
Location: Where the Rig is Parked
Posts: 1,393
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Bad Ground or dirty connection
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11-13-2015, 11:11 AM
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#3
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Senior Member
Join Date: Jun 2012
Location: AB
Posts: 7,587
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Give this a try,
Running across the top of the generator is the control umbilical harness. Unplug the connection in this cord, spray it with some Electrical Contact Cleaner, put a dab of Dielectric Grease on the pins and reassemble.
In addition to the generator, I was having strange things happening with my dash gauges. Spent an afternoon pulling every plug on the firewall, cleaning and reassemble. Now, the Gauges work fine. All it takes is poor contact on one of these pins to cause trouble.
__________________
2019 Unity LTV CB, pushed by a 2013 Honda CRV, BlueOx Baseplate, Aventa Bar & Patriot Brake
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11-13-2015, 04:07 PM
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#4
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Member
Join Date: May 2010
Location: New York
Posts: 63
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I cleaned the grounds and even tried to jump it from my car from the back of the generator to rule out battery problems. None of that worked. Sporadically power will return to the switch. If I push it down to prime, it primes and does its thing. As soon as I push it up to start, I loose all power to the switch and nothing happens.
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11-13-2015, 10:31 PM
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#5
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Senior Member
Join Date: Jun 2012
Location: AB
Posts: 7,587
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One other thing you might look at is the battery cable and connection at the generator. It is possible the 12V cable coming into the generator has been pinched. During a service on mine, I saw where the cable had been pinched due to lack of support to carry the cable. When the generator was pulled out for service and rolled back in,the cable was being pinched.
That's about all I can offer at the moment.
__________________
2019 Unity LTV CB, pushed by a 2013 Honda CRV, BlueOx Baseplate, Aventa Bar & Patriot Brake
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11-14-2015, 06:53 AM
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#6
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Senior Member
Fleetwood Owners Club American Coach Owners Club
Join Date: Mar 2011
Posts: 6,759
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Generator gremlins. I used to have a Generac that shut down every time I went around a curve.
__________________
2014 American Eagle 45T
DD 13, 500 HP
Pulling a Honda CRV
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11-14-2015, 07:48 AM
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#7
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Senior Member
Join Date: Jun 2011
Location: FL
Posts: 11,403
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What model is your RV?
Tracking the heavy wires that provide power to the generator should not be extremely difficult. If you have not done any battery connection maintenance I would start there. First take several pictures of the wires and batteries. Then clean and tighten every connection you can find.
__________________
Certified Senior Electronic Technician, Telecommunications Engineer, Telecommunications repair Service Center Owner, Original owner HR 2008
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11-14-2015, 07:59 AM
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#8
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Senior Member
Monaco Owners Club
Join Date: Oct 2009
Location: On the road
Posts: 2,115
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What Dennis said in post #3... only leave the plug disconnected and try starting/running with the gen mounted switch. That plug eliminates all your coach start wiring/switches. Many places in that circuit to cause problems you describe.
Good Luck
__________________
Happy Trails,
06 Dynasty Countess III ISL//3060
07 Hummer H3
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11-14-2015, 07:05 PM
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#9
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Senior Member
Join Date: Nov 2009
Posts: 148
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I don't mean to "steal" this thread but could someone tell me where the battery cables enter the above generator.
Thanks, Mike
__________________
2004 Holiday Rambler Endeavor 40 PDQ 330 Cummins
S/N 1RF42464342027368
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11-14-2015, 08:14 PM
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#10
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Senior Member
Monaco Owners Club
Join Date: Oct 2009
Location: On the road
Posts: 2,115
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Rear of the gen, down low. Do not over torque cables... they mount in a plastic block.
__________________
Happy Trails,
06 Dynasty Countess III ISL//3060
07 Hummer H3
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11-15-2015, 08:03 AM
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#11
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Member
Join Date: May 2010
Location: New York
Posts: 63
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I feel like I eliminated coach wiring or battery problems by putting jumper cables on the terminals at the rear of the generator and trying to jump it from my car. The same symptoms happen when I do this. I made a small video to show the problem.
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11-15-2015, 08:38 AM
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#12
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Senior Member
Join Date: Nov 2008
Location: Cosby, Tn
Posts: 6,587
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Quote:
Originally Posted by evotech
Generator stop running and when I test power into the unit I find 12v at the back of the unit. However there is no power at the lighted switch nor at any of the three fuses that I can access under the access panel. The weird thing is that this morning I put a test lamp of the fuses again and found power there, but before I could even try to start it the power mysteriously was gone and the test light no longer lights up? It is a 2004 unit with low hours and always worked well. Chassis batteries are pretty new.
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Has it gotten cold since the last time you started. Hold the start switch down for an extended period. I've seen it take up to a minute while the glow plugs work when ambient temp is low. Can't hurt.
Steve Ownby
Full time since '07
__________________
Steve Ownby
Full time since 2007
2003 Monaco Signature
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11-15-2015, 08:49 AM
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#13
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Senior Member
Monaco Owners Club
Join Date: Oct 2009
Location: On the road
Posts: 2,115
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[QUOTE=evotech;2825728]I feel like I eliminated coach wiring or battery problems by putting jumper cables on the terminals at the rear of the generator and trying to jump it from my car. The same symptoms happen when I do this. I made a small video to show the problem. QUOTE]
Actually you only provided another power source. That did not eliminate coach wiring. Removing the pigtail that goes to the coach is the only way to isolate the genset. If that is disconnected the set can function normally IF there are no gen problems and the problem is in coach wiring.
You could have the big green box sitting on the ground and jump it from your car and it would run...it would be perfectly happy not to be connected to anything. That pigtail contains stop functions that could be a shorted wire or a switch causing your problem. Easy and cheap to at least try it. If it is in coach wiring that's when you real fun will start.
__________________
Happy Trails,
06 Dynasty Countess III ISL//3060
07 Hummer H3
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11-15-2015, 09:02 AM
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#14
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Senior Member
Ford Super Duty Owner
Join Date: Dec 2009
Location: Mcdonough, Ga.
Posts: 5,927
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Since you are losing power to the small wires as you try to start, It sounds like a loose main power wire. Take the ground wire loose and clean the metal surfaces. Reattach try to start. Take the main battery cable to generator loose. clean metal ends reattach. Try to start. Make sure you do the positive wire to the generator (at the battery)
__________________
1998 Pace Arrow 35 ft. F53 Ford V10 2014 Honda CRV toad
32 years mechanic at Delta Air Lines 15 year motorhome service manager. 3 popups....2 travel trailers....5 motorhomes....loved them all.
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