Home » Public Forums » GMCnet » ONAN starting (starter stays engaged after starting)
| Re: [GMCnet] ONAN starting [message #320829 is a reply to message #320825] |
Sat, 22 July 2017 07:51   |
William Shourt
Messages: 35
Registered: August 2015
Karma:
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Ken the Onan is running and the flywheel alternator is putting out 33 VAC the voltage to the solenoid drops to 8 VDC FROM 12 VDC which is enough to hold in solenoid. When I pull the wire off volts drop to 0 VDC. I put the wire back on and no starter running. I think you may be right about partial short to ground. Could it be in the solenoid?
Sent from my iPad
> On Jul 22, 2017, at 2:49 AM, gene Fisher wrote:
>
>> On Sat, Jul 22, 2017 at 2:23 AM Ken Burton wrote:
>>
>> In the following I am assuming that when this failure occurs that the
>> engine has started and is running. If it is not running then ignore the
>> following:
>>
>> It should not be the switch because K1's power should be dropped the
>> moment the engine starts. Even if you are still holding the switch down.
>> This
>
>
> Read here
> http://gmc49ers.blogspot.com/2016/04/onan-start-relay-k1.html
>
>
>
>> is because there is a N/C K2 contact in the circuit. K2 picks up from the
>> Onan Alternator when the alternator reaches 28 + volts AC. This happens
>> within a second or so of the engine starting to run.
>>
>>
>> If the engine is not running, then you need to go look at the start and
>> stop switch(es) and cabling.
>>
>> The start circuit is simple. The start switch(es) simply ground K1 which
>> applies power to the starter and also picks K3 to supply power to the
>> ignition and fuel pump.
>>
>> I'm a little confused by the voltage readings that you posted. If K1 is
>> energized, then the coil terminal should read 0 volts (to ground). If the
>> K1
>> coil is not energized then the K1 coil terminal should read battery
>> voltage which is around +12 volts.
>>
>> The 8 volt reading that you mentioned means that you have something with a
>> partial short or a short through another component to ground.
>> --
>> Ken Burton - N9KB
>> 76 Palm Beach
>> Hebron, Indiana
>>
>> _______________________________________________
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>>
> --
> Gene Fisher -- 74-23,77PB/ore/ca
> “Give a man a fish; you have fed him for today --- give him a URL and
> -------
> http://gmcmotorhome.info/
> Alternator Protection Cable
> http://gmcmotorhome.info/APC.html
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> GMCnet mailing list
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