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Re: ONAN starting [message #320824 is a reply to message #320822]

Sat, 22 July 2017 04:11

Ken Burton

Messages: 10030
Registered: January 2004
Location: Hebron, Indiana

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Senior Member

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 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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[Message index]

		ONAN starting By: Bill Shourt on Fri, 21 July 2017 14:04
		Re: [GMCnet] ONAN starting By: James Hupy on Fri, 21 July 2017 14:49
		Re: [GMCnet] ONAN starting By: William Shourt on Fri, 21 July 2017 18:15
		Re: [GMCnet] ONAN starting By: Carl S. on Fri, 21 July 2017 19:09
		Re: [GMCnet] ONAN starting By: William Shourt on Fri, 21 July 2017 19:17
		Re: ONAN starting By: lqqkatjon on Fri, 21 July 2017 22:35
		Re: ONAN starting By: Ken Burton on Sat, 22 July 2017 04:11
		Re: [GMCnet] ONAN starting By: Mr ERFisher on Sat, 22 July 2017 04:49
		Re: [GMCnet] ONAN starting By: William Shourt on Sat, 22 July 2017 07:51
		Re: [GMCnet] ONAN starting By: Ken Burton on Sat, 22 July 2017 10:54
		Re: [GMCnet] ONAN starting By: Bullitthead on Sat, 22 July 2017 13:29
		Re: [GMCnet] ONAN starting By: William Shourt on Sat, 22 July 2017 14:07
		Re: [GMCnet] ONAN starting By: Bullitthead on Sat, 22 July 2017 14:48
		Re: [GMCnet] ONAN starting By: William Shourt on Sat, 22 July 2017 13:46
		Re: [GMCnet] ONAN starting By: Ken Henderson on Sat, 22 July 2017 18:00
		Re: [GMCnet] ONAN starting By: Bullitthead on Sat, 22 July 2017 19:09
		Re: [GMCnet] ONAN starting By: bwevers on Sat, 22 July 2017 20:32
		Re: [GMCnet] ONAN starting By: Ken Henderson on Sat, 22 July 2017 22:51
		Re: [GMCnet] ONAN starting By: Ken Henderson on Sun, 23 July 2017 09:53
		Re: [GMCnet] ONAN starting By: William Shourt on Sun, 23 July 2017 18:17
		Re: [GMCnet] ONAN starting By: Guy Lopes on Tue, 25 July 2017 00:51
		Re: [GMCnet] ONAN starting By: Bruce Hart on Tue, 25 July 2017 05:59
		Re: [GMCnet] ONAN starting By: Ken Henderson on Tue, 25 July 2017 06:09
		Re: [GMCnet] ONAN starting By: jimk on Tue, 25 July 2017 10:03
		Re: [GMCnet] ONAN starting By: William Shourt on Tue, 25 July 2017 13:23
		Re: [GMCnet] ONAN starting By: William Shourt on Tue, 25 July 2017 13:29
		Re: [GMCnet] ONAN starting By: William Shourt on Tue, 25 July 2017 13:32
		Re: [GMCnet] ONAN starting By: William Shourt on Tue, 25 July 2017 14:19
		Re: [GMCnet] ONAN starting By: Ken Burton on Tue, 25 July 2017 15:11
		Re: [GMCnet] ONAN starting By: Emery Stora on Tue, 25 July 2017 20:30
		Re: [GMCnet] ONAN starting By: Ken Henderson on Tue, 25 July 2017 21:15
		Re: [GMCnet] ONAN starting By: William Shourt on Sat, 22 July 2017 07:57
		Re: ONAN starting By: lqqkatjon on Sat, 22 July 2017 15:32
		Re: ONAN starting By: Ken Burton on Sat, 22 July 2017 20:14
		Re: ONAN starting By: JohnL455 on Sun, 23 July 2017 16:34
		Re: ONAN starting By: JohnL455 on Sun, 23 July 2017 16:38
		Re: ONAN starting By: Ken Burton on Sun, 23 July 2017 21:17
		Re: [GMCnet] ONAN starting By: William Shourt on Sun, 23 July 2017 23:09
		Re: [GMCnet] ONAN starting By: Ken Henderson on Sun, 23 July 2017 23:35
		Re: ONAN starting about 2 K windings By: Matt Colie on Mon, 24 July 2017 09:28
		Re: [GMCnet] ONAN starting about 2 K windings By: William Shourt on Mon, 24 July 2017 13:26
		Re: [GMCnet] ONAN starting about 2 K windings By: Ken Henderson on Mon, 24 July 2017 20:56
		Re: [GMCnet] ONAN starting about 2 K windings By: Bullitthead on Mon, 24 July 2017 23:15
		Re: [GMCnet] ONAN starting about 2 K windings By: William Shourt on Mon, 24 July 2017 23:23
		Re: ONAN starting about 2 K windings By: Ken Burton on Mon, 24 July 2017 23:19
		Re: ONAN starting about 2 K windings By: Ken Burton on Tue, 25 July 2017 01:15
		Re: [GMCnet] ONAN starting about 2 K windings By: Ken Henderson on Tue, 25 July 2017 06:14
		Re: ONAN starting By: bwevers on Tue, 25 July 2017 00:22

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