Obviously I'm not Jon, but his observation on field current if armature was actually at 68 volts when clips turned red is a good one. I have worked with many generators and even open circuited, have not seen 68 volts. 20 to close to 30 occasionally. So my next recommendation would be to get a decent analog voltmeter, rather than chase ghost with perhaps bogus voltage readings. A reasonable fields test would be to connect a 12v battery with series ammeter between ARM and Field terminals of generator (not running) and measure the field current. Gen housing floating (not grounded). Most will not even see the 4 amperes that I mentioned earlier, perhaps half or less.
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Today's Featured Article - Tuning-Up Your Tractor: Secondary Ignition Wires and Distributor - by Curtis Von Fange. In our last episode we spent the entire day checking out the spark plugs. Is that efficency? Actually, it took more time to explain than it really did to do the inspection. At any rate we decided that a compression test was in order so we could verify the internal engine status. That way we wouldn't buy any tune up parts until we were sure that the engine was in reasonable mechanical condition. Our tests showed a fictional compression reading of 85, 80, 82 and 86 psi. That is well within a
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