Posted by Steve@Advance on July 31, 2015 at 20:14:44 from (107.203.134.67):
In Reply to: Oliver electrical posted by deputy dog on July 31, 2015 at 19:19:31:
The Oliver was originally 12v positive ground (according to Tractor Data). If so, it would have been switched to negative ground when the alternator was added.
The amp meter not working...
If it works backward, just switch the wires on the back of the amp meter.
If it doesn't move, possibly it was not properly wired when the alternator was added. This is a simple diagram of how it's wired. http://ww2.justanswer.com/uploads/indytech/2012-03-25_215414_ammeterwiring.jpg
If it's wired properly and doesn't move, or the needle doesn't return to center when the load is removed, the gauge is bad.
Some fuel gauges are polarity sensitive. The way to test it is to remove the gauge wire from the sending unit on the tank. With the ignition on, the gauge should now read empty. Next, connect the wire to a known good ground. The gauge should read full. If it passes this test, the sending unit in the tank is bad. (Be sure the tank is grounded, some are rubber mounted and require a ground wire.)
If the gauge fails this test, either the gauge is defective, it's not wired correctly, or it is polarity sensitive.
Replacing the gauge with a negative ground gauge can be tricky. The gauge must be matched to the sending unit with the proper resistance to work properly.
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