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02-22-2018, 07:18 AM
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#1
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Junior Member
Join Date: Dec 2015
Location: Palm City,FL
Posts: 4
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Onan Generator 7500 Diesel Wont Start by Switches
Hi,
We Own 1999 Airstream Class A 37 ft on Freightliner Chassis, Cat Diesel Pusher
Oman 7500 Diesel
A little history, bought Rv private sale 7/17, its in great shape. A while ago had problem with generator
starting on its own. Regardless, if it was plugged into shore line or just sitting it would
just try to start on its own. I read an old post where others had this issue. I found main harness plug on
passenger side generator was little corroded so I cleaned it. Problem seemed to be solved for week or so.
Keep in mind, I test run earthing
weekly because we live here in Fl where humidity is high.
Yesterday, it didn’t matter what switch I tried inside the coach or on the gen. itself. The gen. would not turn over to start.
It would click and preheat, but wouldn’t turn over, so I figured it probably had a ground problem. The batteries, 4 coach
and 2 for Cat motor are 5 yrs old. I cleaned all post, checked water levels and I test loaded them. All the batteries are fine,
11 -12 V under heavy draw for 15-20 seconds and recover quickly to 12.5 -13+ V.
When I wiggled the engine gen. (up & dwn like to start) it tried to turn over, but now it won’t do anything.
Has anyone dealt w/ this before and what did you find ?
Could I have a bad solenoid or relay somewhere.
Don’t claim to be tech or mechanic, but I can do more than the average
Any help out there?
Mike
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02-22-2018, 07:41 AM
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#2
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Senior Member
Monaco Owners Club
Join Date: Jan 2008
Location: Olympia, Wa
Posts: 2,772
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Try emergency start and Gen start at same time. Check ground, batteries to coach. Check ground to Gen. Check Hot to Gen from batteries at Gen and at batteriers. Now if still no start time to start looking at Gen.
LEN
__________________
2004 Clss C 31' Winnebgo
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02-22-2018, 07:42 AM
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#3
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Registered User
Winnebago Owners Club
Join Date: Feb 2018
Posts: 1,336
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The Start switch does have to be held down for several seconds sometimes longer for the preheat when it's cold outside.
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02-22-2018, 01:28 PM
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#4
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Junior Member
Join Date: Dec 2015
Location: Palm City,FL
Posts: 4
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Has to be ground issue. Walked out today & just tried it. Started inside coach, both switches started generator. Went outside checked switch mounted on gen. Guess what it also started. What the heck. It must be a ground.
Let me ask you this guys. Is there a reset safety switch that went into safety mode yesterday & it just reset overtime. ????
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02-22-2018, 01:32 PM
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#5
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Registered User
Winnebago Owners Club
Join Date: Feb 2018
Posts: 1,336
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Quote:
Originally Posted by Edsel
Has to be ground issue. Walked out today & just tried it. Started inside coach, both switches started generator. Went outside checked switch mounted on gen. Guess what it also started. What the heck. It must be a ground.
Let me ask you this guys. Is there a reset safety switch that went into safety mode yesterday & it just reset overtime. ????
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We have had the 5500, 7500, and now 8000 and are not aware of a reset switch affecting the starting on an Onan.
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02-22-2018, 02:31 PM
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#6
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Senior Member/RVM #90
Monaco Owners Club
Join Date: Nov 2002
Location: Columbus, MS
Posts: 54,758
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Hi Mike! Welcome to IRV2! We're sure glad you joined the gang!
I haven't encountered that problem before so can't be of any help! Keep her between the ditches!
Good luck, happy trails, and God bless!
__________________
Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD
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02-22-2018, 02:51 PM
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#7
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Senior Member
Tiffin Owners Club
Join Date: Aug 2016
Location: Bastrop Texas
Posts: 1,343
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I would be suspect at the generator start solenoid. All th start switches do no more that activate the solenoid to engage the positive line to the starter. I would go to the solenoid and check the connection there. Solenoids go bad slowly understanding that all that is happening is you are integising a magnet that makes the contact between the in coming large 12v wire to the large 12v wire going to the starter.
__________________
2000 Allegro Bus 35R 3126 Cat 300 Allison 3060MD 6 speed
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02-22-2018, 04:13 PM
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#8
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Junior Member
Join Date: Dec 2015
Location: Palm City,FL
Posts: 4
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Yeah after I cleaned battery terminals today, on back gen. I let gen run for hr. everything seemed good. Walked away from RV within 5 min it tried to start again. It Did it once. Where is the solenoid
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02-23-2018, 06:11 AM
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#9
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Senior Member
Monaco Owners Club Vintage RV Owners Club Holiday Rambler Owners Club
Join Date: Jul 2012
Location: Lexington, SC
Posts: 2,818
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Here is a link for the service manual. It may help you.
http://www.twinslan.net/~n0nas/manua...0(06-2010).pdf
__________________
Vera & Ken
1998 Holiday Rambler Imperial, RR8S Chassis
Cummins 6C8.3 mechanical engine, 325HP, 3060 Allison
Towing 2014 Ford Explorer
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02-24-2018, 03:39 AM
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#10
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Junior Member
Join Date: Dec 2015
Location: Palm City,FL
Posts: 4
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Thx
Yesterday, I was doing more maintenance, cleaning grounds checking wires and everything tested ok. No issues w/it trying to start on its own. At approx 6 pm I was walking away from Rv & gen tried to start once.. Very weird.
From what I reading the solenoid is like a lot of cars,mounted right on starter
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