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Re: [GMCnet] ONAN starting [message #320832 is a reply to message #320829]

Sat, 22 July 2017 10:54

Ken Burton

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

Karma:

Senior Member

I am sitting here looking at the Onan Wiring diagram that Colonel Ken made. +12 volts should always be on one side of the K1 coil. The Onan board controls the K1 coil by applying ground (-12vdc) on the opposite side of the coil. There is one wire from the K1 coil to pin 7 on the Onan board. There should be no other wiring connections to either the coil terminal or pin 7 on the Onan board.

That said, Pin 7 on the Onan board goes only to the N/C point of K2 and no where else. So when K2 is powered by the 33VAC from the alternator, the K2 N/C point should open up and block any path to the ground side of K1. So at this point I would suggest that you have a wiring error, or a short on the board, or a tacked relay point on K2. Even if you had a tacked relay point, the voltage should drop to K1 when you remove your finger from both of the starting switches.

I guess that there is a possibility that there could be a worn spot on the coil that when energized the armature might short to. I have never seen this but it is the only idea that I have right now on what could be causing this problem. That is just a wild guess because I have never seen of or heard of this failure.

Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana

[Updated on: Sat, 22 July 2017 10:57]

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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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