Posted by oldtanker on December 11, 2011 at 21:58:23 from (66.228.255.223):
In Reply to: electrical conversion posted by smhimrod on December 10, 2011 at 08:14:04:
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LJD....It takes a little longer to start than 15 seconds when it's -20 out. Plus I've never had an alternator hit peak out put from charging. I have an AMP meter on the tractor with the one wire. For it to get close to 0 AMPS it's gotta run about 10 min hitting a peak output of about 25 Amps. And at -20 I start and leave it about 1000 RPMS for about 10 min. Then never run it faster than that while feeding a bale which only takes about 3 min. Then it takes about another 10 min at 1500 RPMs to get the alternator to kick in and for it to drop rom about 20-25 AMPS to near 0. When you get -20 to -30 you don't play around with battery charge. You make sure before it gets cold that everything is good and then be sure to keep the battery up on charge.
Besides that the alternator may put out 50 AMPS but just because you are trying to cram that in isn't a sure bet that the battery will accept a charge rate that fast. And that advertized charge rate isn't at 1500 RPMs....
I am going over to the 3 wire on the tractor with the one wire because it will reduce the amount of time I'm out in - weather. My 2 tractors with the 3 wire charge at about 500 RPMS as soon as the tractors start. Just too bad that they are big enough to move 1800 pound bales.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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