Posted by Tom in Iowa City on April 08, 2009 at 14:57:48 from (173.21.35.134):
This is a follow-up to my recent posting, "battery drain." It concerns my 1941 Farmall A. I removed the electrical box to paint it. Upon reassembly, the problem surfaced. I just had a friend over, who is competent with electrical circuits and we did some work but could not solve the problem. I have the optional headlights and taillight on my tractor. Here is the problem: when the switch is in the low charge position (full counterclockwise), the ammeter shows a charge. When the switch is turned to the high charge, dim lights or bright lights position, there is a full discharge shown on the ammeter. It pins immediately to the minus 20 position. We are supposing a short between two wires or a ground between a wire and the tractor frame, but we are unable to find one. At some point, we had some overheating in the box and even some smoke in the box. When we have the battery ground wire off of the battery, put the switch to the low charge position and then reattach the battery ground wire to the battery, there is NO arcing. When we have the battery ground wire disconnected from the battery and put the switch to any of the high charge, dim lights or bright lights positions and then reconnect the battery ground wire to the battery, we get some arcing. We are wondering if I caused damage to either the switch or some other part of the electrical system when I messed with my re connections and especially, at one point, turned the switch to various positions when I did NOT have the ground established because I did this when the electrical box cover was NOT attached to the electrical box. Thanks for any input. Tom in Iowa City.
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