Posted by rtr on October 10, 2011 at 17:18:43 from (98.83.136.115):
I have a 1975 IH Cub tractor that was originally 12 volt generator system. The previous owner converted that system over to 12 volt alternator. It wasn't showing ANY activity on the ammeter, and was discharging the battery over time, so I decided to take a look at it. When I removed the hood I saw that the ammeter wasn't even hooked up (no wires going to it). Everything else was, and when I stuck a screwdriver to the back of the alternator, it magnetized and proved to be working.
Here's where it gets weird....
I traced the original wiring (per the diagram), and the Gray & Red wires (gray coming from the alternator & red from the magnetic starting switch) were twisted and wired together back at the dashboard. I noticed from the diagram that both wires were supposed to hook to each of the terminals on the ammeter. I took alligator clips and cliped them to the ammeter, fired up the engine, and tested voltage at the battery. Multimeter started going nuts (voltage readings), and then I tested both terminals at the ammeter. Multimeter readings were going nuts.
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