alternator on farmall M

tsradke · Oct 17, 2011

I installed a delco 10SI alternator on my 1947 farmall M and followed all the directions found in a post on this website perfectly, and when I turn the trator on and idle it the "warning light comes on and stays on like its supposed to but it never shuts off even at full throttle and the ammeter comes close to 0 but is never on the charge side. The pully on the alternator is maybe 4" in diameter, am I still not getting enough rpm for it to charge?

tsradke · Oct 17, 2011

I should add that it is all new wiring in all the right gauges, a junkyard alternator but I had it checked out and it tested good, a new ammeter and a new switch. It has been switched over to 12v ignition for quite awhile but I just charged the battery when it got low instead of adding an alternator.

gene bender · Oct 17, 2011

yup your pulley is too small

60 acre hillside · Oct 17, 2011

Gene, You mean it is too large.the little one will make more turns in a given time

Anonymous-0 · Oct 17, 2011

at full throttle you should be chargeing, with a 4" pully on the alternator you would be truning it faster tha a car or truck at idle. 100s of tractors out there with 10si alternators on them working every day, something else wrong.

Dave Sherburne NY · Oct 17, 2011

I'm pretty sure that you would need a smaller pulley on the alternator in order for it to turn faster.

Red Mud · Oct 17, 2011

Did you do it like this, well you should have. and your pulley is fine, it's the same size i have on my H farmall.

tsradke · Oct 18, 2011

you didnt put a warning light in it like the article said? is it not necessary? but other than that it is exactly the same.

JMOR · Oct 18, 2011

(quoted from post at 19:16:03 10/17/11) Did you do it like this, well you should have. and your pulley is fine, it's the same size i have on my H farmall.

he physical positions of the two wires on the plug are reversed left & right in your drawing.

Red Mud · Oct 18, 2011

I didn't put a warning light on my H,It's been running for at least 15 years this way with no problems..

alternator on farmall M

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