Posted by notjustair on January 09, 2014 at 17:59:06 from (174.229.65.16):
My Farmall M is 12 volt. It has a Delco three wire alternator on it. I have it set up with a multiple pole toggle on/off switch to excite.
During the summer it works just as it normally should. Charges about 10 amps and then backs off. During the winter it is squirrelly. If it is below freezing it doesn't charge when I first start it. I start going about my chores and about 5 minutes later it starts charging normally. It is like it has to warm up first. It doesn't matter whether I give it a larger load (I just chored and turned on the lights right when I started it). If I shut it down and then start it again it works normally. It isn't like it needs more throttle to get it started - that doesn't make a difference. It got a new battery a while back - that wasn't it either. The only variable that could be causing it is temp. I have eliminated all other variables.
I have put Delco units on several other tractors around here and they don't do it. What would need to warm up in there to make it charge? It's got me puzzled. I expect it and it is just fine like it is, but I always wonder about it.
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