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05-15-2014, 02:25 PM
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#1
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Rivet Master
1982 31' Airstream 310
champaign
, Illinois
Join Date: Oct 2012
Posts: 4,071
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Genset has me stumped
I have the onan 6500 in my 310 and today it decided that it would crank over very very slow and not start. Ive got brand new batteries for the chassis and the coach. So i first checked the voltage at the batteries and all were good. Triple checked all connections to the batteries, removed and cleaned ground to frame and the ground on the block of the genset. Tightened connections to my disconnect switches and the solenoid (?) on the outside of my battery box. Pulled the cover off the genset to expose the solenoid and have 12.9 volts on the incoming side. It does engage when i press the start button but it cranks very slow like a dead battery would.
Would it do any good to jumper across the solenoid and see if it will start? Could it be a bad connection inside the solenoid? Im obviously no mechanic here. It had been starting just fine till today. I assume nothing on the load side would have anything to do with it starting........there i go again making assumptions! Any ideas on what next to do to troubleshoot?
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05-15-2014, 02:30 PM
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#2
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Rivet Master
Currently Looking...
Mantua
, Ohio
Join Date: Jul 2005
Posts: 7,062
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Make sure the air cond and everything else is off and then try again. Jim
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05-15-2014, 02:40 PM
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#3
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Rivet Master
1978 25' Tradewind
Metro Phoenix
, Arizona
Join Date: Jun 2003
Posts: 1,524
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It could certainly be bad contacts inside the solenoid. I like the idea of jumpering across the solenoid, but keep in mind that there will be come serious current going through that jumper, so definitely use your industrial eye protection.
Here's the service manual, see page 102 for solenoid checking....
If that's the issue, and you can figure out how to get the solenoid apart, you might be able to clean the contact bar, or even turn it over to use the fresh side (I have no idea what it looks like inside, so don't take that too seriously)
__________________
"Between what matters and what seems to matter, how should the world we know judge wisely?" - E.C. Bentley, Trent's Last Case
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05-15-2014, 04:00 PM
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#4
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Rivet Master
1982 31' Airstream 310
champaign
, Illinois
Join Date: Oct 2012
Posts: 4,071
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Thanks so much for the quick reply folks, and the link to the manual is fantastic.
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05-15-2014, 04:29 PM
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#5
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Rivet Master
1969 31' Sovereign
Broken Arrow
, Oklahoma
Join Date: Jan 2003
Posts: 1,455
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Well you know one thing, good voltage low current means a bad connection adding resistance somewhere between the battery terminals and generator starter or shorted windings internal to the genset starter.
Sounds like you checked most everything my next step would be to try to jump start the generator with jumper cables and a good battery.
__________________
Garry
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05-15-2014, 04:33 PM
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#6
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Rivet Master
1982 31' Airstream 310
champaign
, Illinois
Join Date: Oct 2012
Posts: 4,071
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I forgot to mention that garry, thats another thing i tried doing. Sure seems like a bad connection that im missing.
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05-15-2014, 04:36 PM
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#7
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Rivet Master
2002 30' Classic S/O
Fleming Island
, Florida
Join Date: Nov 2013
Posts: 4,668
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Can you measure the voltage on the starter side of the solenoid?
__________________
“You cannot reason someone out of a position they have not been reasoned into"
Al, K5TAN and Missy, N4RGO WBCCI 1322
2002 Classic 30 Slideout -S/OS #004
2013 Dodge 2500 Laramie 4x4 Megacab Cummins
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05-15-2014, 04:44 PM
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#8
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Rivet Master
1982 31' Airstream 310
champaign
, Illinois
Join Date: Oct 2012
Posts: 4,071
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I havent had a helper yet to hold the start button while i check that side but thats next on the list, that might tell me a lot.
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05-15-2014, 04:49 PM
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#9
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Rivet Master
2002 30' Classic S/O
Fleming Island
, Florida
Join Date: Nov 2013
Posts: 4,668
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I had an outboard that was a slow starter once. The starter had two sets of brushes so that two windings 90 degrees apart were energized at one time. One brush went bad and stuck so that only one winding was energized. Replacing the brushes fixed the problem. If you have full voltage on the starter side you may have something similar going on.
__________________
“You cannot reason someone out of a position they have not been reasoned into"
Al, K5TAN and Missy, N4RGO WBCCI 1322
2002 Classic 30 Slideout -S/OS #004
2013 Dodge 2500 Laramie 4x4 Megacab Cummins
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05-15-2014, 05:11 PM
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#10
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Rivet Master
1982 31' Airstream 310
champaign
, Illinois
Join Date: Oct 2012
Posts: 4,071
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Ive definitely got good voltage on the battery side so i immediately thought its time to go through and clean up all the grounds. Since ive only had my 310 for 8 months or so it was on my list. Boy i hope i dont have to pull this thing, i saw the weight on it, and i dont have a fork lift handy!!! Good suggestions all. Ill keep plugging away here, its been starting and running well so im hoping..............
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05-16-2014, 10:46 AM
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#11
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Rivet Master
1982 31' Airstream 310
champaign
, Illinois
Join Date: Oct 2012
Posts: 4,071
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Went through and used a rotary tool and wire wheel on all the grounds this morning and tightened them all up again, checked all my positive leads and cleaned, and bammmm, started right up. I dont know which one was the problem but at least i know all my grounds are good and clean. At least the ones from the battery to the generator. Boy i was hoping it was something easy. Thanks for all the input folks. Now im going to rewire the rear air conditioner feed and add ann extra chord to run off shore power or generator. Will post pics if i can figure out how to copy and paste off my ipad.
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05-16-2014, 05:07 PM
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#12
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Rivet Master
1994 36' Classic 36 Diesel
Colorado Springs
, Colorado
Join Date: Mar 2012
Posts: 883
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From broke to fixed in less than 24hrs... nicely done!
__________________
1994 36' Classic Diesel Pusher
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05-17-2014, 10:17 PM
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#13
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Rivet Master
2016 Interstate Grand Tour Ext
Wildwood
, Florida
Join Date: Oct 2009
Posts: 1,236
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Mayco. Definitely post pics of the additional shore power feed. That is on my list of things to do.
Good luck with the iPad, it is not very posting friendly!
__________________
Dave and Felicia
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05-18-2014, 05:03 AM
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#14
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Rivet Master
1982 31' Airstream 310
champaign
, Illinois
Join Date: Oct 2012
Posts: 4,071
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I just finished it up yesterday and it seems to be working as it should. Ill get some pictures today and write up a description of what i did, there was a bit of head scratching but i got it done. I google searched similar threads and found a few that helped a little bit but realized that airstream wired these things different on every coach down the line, it seems anyway. Frustrating to say the least. Ill do my best to get something posted today.
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05-18-2014, 05:21 AM
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#15
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Rivet Master
1982 31' Airstream 310
champaign
, Illinois
Join Date: Oct 2012
Posts: 4,071
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Wxbouy,
Search a thread titled "running rear air when docked". It was posted by ftjbc, on feb. 8th, 2008. Sorry i cant figure out how to give you the link but youll find it. Thats the thread that helped me the most and within it has some links to drawings and such. The difficult part for me was that my rig didnt resemble the wiring described in that thread. But it does have some helpful info regardless. Take a peak at that and in the mean time ill get started on some pics and description of mine.
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05-25-2014, 04:36 AM
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#16
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Rivet Master
2016 Interstate Grand Tour Ext
Wildwood
, Florida
Join Date: Oct 2009
Posts: 1,236
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Quote:
Originally Posted by mayco
Wxbouy,
Search a thread titled "running rear air when docked". It was posted by ftjbc, on feb. 8th, 2008. Sorry i cant figure out how to give you the link but youll find it. Thats the thread that helped me the most and within it has some links to drawings and such. The difficult part for me was that my rig didnt resemble the wiring described in that thread. But it does have some helpful info regardless. Take a peak at that and in the mean time ill get started on some pics and description of mine.
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Mayco,
Thanks! I have read that thread in my travels. As you point out, they all seem to be wired differently!! And there lies the head scratching since it all has to be tweaked to your rigs wiring setup.
__________________
Dave and Felicia
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05-25-2014, 07:15 AM
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#17
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Rivet Master
1982 31' Airstream 310
champaign
, Illinois
Join Date: Oct 2012
Posts: 4,071
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Wxbuoy,
Check out the thread i started yesterday on adding an additional shore power chord for rear ac. I finally was able to down load a pic from my ipad and it shows what i did. Mine was sooooo simple cause i didnt have any switch gear or anything from the factory set/up. It worked !!! Yeeeeeehawwwww
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05-25-2014, 08:35 AM
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#18
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Rivet Master
2016 Interstate Grand Tour Ext
Wildwood
, Florida
Join Date: Oct 2009
Posts: 1,236
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Mayco,
Will do and glad it was a success!
__________________
Dave and Felicia
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05-26-2014, 12:33 PM
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#19
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Rivet Master
2016 Interstate Grand Tour Ext
Wildwood
, Florida
Join Date: Oct 2009
Posts: 1,236
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Quote:
Originally Posted by mayco
Wxbouy,
Search a thread titled "running rear air when docked". It was posted by ftjbc, on feb. 8th, 2008. Sorry i cant figure out how to give you the link but youll find it. Thats the thread that helped me the most and within it has some links to drawings and such. The difficult part for me was that my rig didnt resemble the wiring described in that thread. But it does have some helpful info regardless. Take a peak at that and in the mean time ill get started on some pics and description of mine.
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Here is the link for others that might want it:
http://www.airforums.com/forums/f311...ked-39598.html
__________________
Dave and Felicia
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