Posted by RTR on April 13, 2013 at 21:53:42 from (74.240.94.2):
1964 Farmall 140 with 12 volt generator system with external regulator.
Noticed generator wasn't charging so we grounded the field post on the generator to bypass regulator. Nothing changed and no movement st the ammeter, therefore we diagnosed it as a faulty generator.
Installed another generator from parts tractor
, polarized it, and it was showing a "discharge" on the ammeter. I reversed the wires on the ammeter and it started reading correctly and was charging well.
At this time I decided to replace the on/off toGGLE switch with a key style on/off switch like it had originally. I had one I picked up at tractor supply that was for the ford 600/601 series tractor that was an on/off style key switch. I hooked it up using the 2 wires that were on the toggle and didn't pay much attention to which wires hooked were.
We then preceded to reinstall the new battery and complete battery box. Once everything was all back together we noticed the amp gauge was all the way to the right and was "pegged out". We started the tractor and the meter started reading a "discharge" again!
We started investigating and found that the "Gen" wire (middle of the 3) on the voltage regulator was really hot. I started to unhook the "bat" wire ( the one by itself )from the voltage regulator and it was sparking when touched. Once that wire was unhooked the needle on the ammeter went back to the center.
My question is....does this mean I have bad regulator ?? I have a new one to install but would like to know before I try and possibly ruin it. Could it have been something I did prior?
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