Been having trouble with mine too. First of all, see that the relay is really passing current. Mine was bad. Sounded, worked OK, but current not reaching glow plugs. Finally figured that out, and replaced relay. Even with 5 plugs working, starts pretty reliably. Bypassed the self timer with a simple switch, couple years ago. Those timers aren"t long lived, and they want a fortune for them. I can count to 8 seconds as well as a timer can, then I switch it one for a couple second bursts while starting, and the first minute or so of running. I have found the most reliable way to test glow plugs is with a 12 volt test lite. Connected between the + battery terminal, and the spade terminal on the glow plug (unplugged from harness.) Light lights, glow plug is good. I had a nightmare a few years back. Air kept collecting in fuel filter. Mine has aftermarket filter - looks like a small version of a gasoline storage tank filter, plastic globe, centrally mounted filter element. Finally traced it to the intake unit in fuel tank. Never did find what was leaking to allow air into the line. Replaced intake line, fuel guage unit, finally solved the problem. If you don"t have electrical engine heater, you should get one. When temps are in the 20"s or lower, may mean the difference between starting and not starting. Mine is 550 watts, in block unit. three hours, and the thermostat housing is warm to the touch. Makes a heckova difference.
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Today's Featured Article - The Revival of a John Deere Combine - by The Red, John Fritz. For several years I had been driving by a farm house on the west side of Indianapolis that had a John Deere combine parked in high weeds in a lot behind the house. The gentleman no longer farmed because the entire area was developed with housing and light industry. I had stopped several times and knocked on the door but no one would answer. My curiosity was up and I wanted to contact the owner. I wanted to see what he planned to do with the combine.
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