Ford 4000 does not have glow plugs. They have a thermostart in the intake manifold. Depending if it has the original key switch or the later version, will depend on which terminal of the switch the large brown wire going to the thermstart hooks to. The original switch had to turn to the left to heat the thermostart and the newer switches heated when turned to the right. I may have a diagram, but won't be back in the shop till monday.Wiring on these tractors is very simple can be traced out in a few minutes with a test light.
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Today's Featured Article - Farmall 460: That's My Girl - by LeAnn R. Ralph. How many sounds can you think of that are as familiar to you as your own breathing? What about the hum of your refrigerator? Or the thump of your clothes dryer? Maybe the engine of your car? You hear those sounds every day, and you don't think much about them, do you. I can think of a few common, ordinary sounds in my daily life, too.
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