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Re: [GMCnet] ONAN starting [message #320825 is a reply to message #320824] Sat, 22 July 2017 04:49 Go to previous messageGo to previous message
Mr ERFisher is currently offline  Mr ERFisher   United States
Messages: 7117
Registered: August 2005
Karma:
Senior Member
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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