Hot Rod Posted August 15, 2018 Report Share Posted August 15, 2018 (edited) I've got an onan 5500 in a 2004 fifth wheel. Running good, then sat for a few months. Now it won't start, and by that I mean won't crank, won't prime, does not seem to be power to either the panel inside the camper, or the prime/start switch right on the generator. Nothing. Seems completely dead. Brand new battery. Battery cable ends removed and cleaned on both ends. All the power for the unit seems to come all from the positive battery connection inside the generator. There is the 4 ga cable coming from the battery to an isolated post, and from there a white 10 ga wire and a double white 16 ga wire on the same post. Good power on the post and all terminals, and I stabbed the wires to make sure power past the terminals actually into the wire. There don't seem to be any fuses or circuit breakers (12v) in there. Any ideas? Thanks! Edited August 16, 2018 by Hot Rod Quote Link to comment Share on other sites More sharing options...
Hot Rod Posted August 16, 2018 Author Report Share Posted August 16, 2018 No idea what I did, but it is working now. Quote Link to comment Share on other sites More sharing options...
bobsallyh Posted August 16, 2018 Report Share Posted August 16, 2018 Hot Rod, several years ago, our Onan Marquis 7000, just shut off. So I start to look at the wiring harness and one of those wonderful 16 ga. wires fell right out of the crimp. Crimped back together and haven't had a shutdown problem but many others. Just absolutely love the all-white wiring harness. Quote Link to comment Share on other sites More sharing options...
Kirk W Posted August 16, 2018 Report Share Posted August 16, 2018 (edited) 12 hours ago, Hot Rod said: No idea what I did, but it is working now. I would look for a loose or dirty connection. It is likely to return if you do nothing. Try reseating all of the connector plugs for the controls & power. Edited August 16, 2018 by Kirk Wood Quote Link to comment Share on other sites More sharing options...
oldjohnt Posted August 16, 2018 Report Share Posted August 16, 2018 Once you have checked all the high current 12 Volt and grounds and battery cable type of connections I would next suspect all the low current (maybe 14 gauge and even smaller) control plugs and connectors as I have often seen them get loose and/or dirty and corroded. Some have a factory white looking anti oxidant grease coating. Even if the major high current cables and connections are good (yours may well be) it don't take much of a faulty control connection to cause your problem. John T Quote Link to comment Share on other sites More sharing options...
Hot Rod Posted August 17, 2018 Author Report Share Posted August 17, 2018 Thanks for all the suggestions. It is likely I wiggled whatever connector that was not quite connecting. I had the breaker housing (that hides all those WHITE wires) off and twisted all around so I could see the back. I think I'll take it back apart and pull every connection and spray it up with terminal cleaner. Quote Link to comment Share on other sites More sharing options...
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