[AT] Ingersoll 6018

Sun Nov 29 06:55:34 PST 2020

Thanks for the info. I got up this morning and went through my checks again. This time I jumped from positive on battery to small connector on the solenoid. That activated the solenoid and starter. Checked voltage on the small wire that excites the solenoid. It only had about 6 volts. Went backward to the safety switch. I had checked it for continuity but not voltage. For some reason it had 12 volts to the switch but only 6-7 exiting. I bypassed the switch and it started right up.

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On Sunday, November 29, 2020, 12:13 AM, Bill Brueck <bill at apluscomputer.com> wrote:

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Any of this type of system that I’ve worked with, the solenoid is activated by a hot wire to the small solenoid terminal.  Jumpering from the hot battery terminal at the starter to the smaller switch terminal would activate the solenoid and thus the starter and is a good test. If terminals are exposed and accessible a screwdriver is all you need to do the jump.  Common problem that shows up as you are describing is that the ground end of the solenoid winding isn’t good.  At least on the old systems I worked on years ago, the ground circuit actually went to the hot and yet unactivated starter terminal. Condition as you describe, including the intermittent part, was usually from short and thus open brushes in the starter.  If rapping the starter with a hammer fixes it, that’s even more confirmation.

Warning that I’m way out of date.  I worked at an Auto Electric shop during college days, over 50 years ago.  Lots of automotive, farm, industrial units came through the shop.  But the system described above is what’s on the Onan engine on my skid loader today.  OK, it’s kind of old, too, LOL.

B²

Bill Brueck

   Pine Island, MN USA

From: AT <at-bounces at lists.antique-tractor.com> On Behalf Ofcraig.warner47346 at frontier.com
Sent: Saturday, November 28, 2020 9:27 PM
To: Antique Tractor Email Discussion Group <at at lists.antique-tractor.com>
Subject: [AT] Ingersoll 6018

Not particularly antique but I’m having an issue with a 1993 Ingersoll 6018 with an Onan P218 engine and I’m betting there will be someone here that knows more than I do. 

I used it all day yesterday. At one point when I turned key to start, the engine didn’t turn. There was no click, no spin...nothing. I turned key again and the starter acted normal. I used it the rest of the day, stopping and starting several times. This morning, it was back to complete silence when I turned the key. Messed around a bit and decided it was the ignition switch. Bought a new one and still nothing. Since then, I’ve:

1. Jumped from large lug to large lug on solenoid. Starter and engine turned like normal.

2. Checked continuity on small wire from solenoid to safety switch. It’s fine.

3. Checked continuity on safety switch. It’s fine.

4. Checked continuity on wire from safety switch to ignition switch. It’s fine.

I’m thinking the solenoid is bad but where I’m a little confused is on testing the small wire that plugs into the solenoid. If the ignition switch is on, should there be voltage at that wire or is it a negative circuit that is completed by turning the ignition switch?

Any help would be appreciated. I’ve attached a screenshot of the wiring diagram for reference.

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