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Farmall & IHC Tractors Discussion Forum
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Ask Your Friendly Ammeter

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A. Bohemian

04-30-2007 15:00:17




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Note: the following test is quickly and easily run as it does not involve connecting or disconnecting anything. All you have to do is put your butt in the seat and OBSERVE...

What does the ammeter read when you turn on the ignition WITHOUT cranking?

It should show approx. 4 amps discharge.

No discharge? Points are bad, open, or there is an open somewhere else. The points are not likely to be open; the engine almost always comes to rest with them closed.

If there is no current flow, old and the others may well be right; Kettering systems like to be started now and again to make sure the surface of the points stays viable. You can perhaps clean them; others can help you better than I with that task.

Normal 4 amp discharge? Crank the motor. The ammeter should fluctuate as the points open and then close and the current flow stops and starts again.

No fluctuation? The points are not opening for some reason or there is a short somewhere.

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chadd

04-30-2007 16:28:58




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 Re: Ask Your Friendly Ammeter in reply to A. Bohemian, 04-30-2007 15:00:17  
I am not sure if anyone else has experienced this, but the needle on our Farmall M with a Delco distributor does not deflect whatsoever even when everything is set correctly. When troubleshooting a while ago, I decided to see if there was an ignition problem. I turned the ignition on with my dad on the seat and rotated the distributor as far as was possible. He said that it never once moved the ammeter needle. I figured that meant there was a problem, so I replaced the points, condenser, checked the advance springs, cleaned the connections, replaced the cap, rotor, and wires. I attempted the same procedure again to re-time the distributor, and my dad was right, again there was no deflection on the needle. I hit the starter, and the engine fired to life and ran really poorly, as the timing was off. I turned the distributor body until I got it running perfectly and then shut it down. Did the test again, and still no deflection. It deflects when the lights are turned on, and deflects varying amounts depending on the setting of the lights. It also shows charge when the tractor is started. Maybe the ignition system is getting its power from the battery and not going through the ammeter? I am pretty sure it gets power from in the light box though. . .

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John M

04-30-2007 17:59:16




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 Re: Ask Your Friendly Ammeter in reply to chadd, 04-30-2007 16:28:58  
Mine too. Thats one reason I kinda bow out of electrical discussions as it seems what everybody else says, nothing of mine does.All I know is when I turn on the lights without it running it discharges,kill switch, dont move.The only one of mine that does it is my 154.



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