Battery voltage , no resistors on this system, goes through a push buttom rather heavily wired, not through ign switch. Meter merely shows if working. Can test each glow plug individually by just hooking up one at a time and it should show near half of gauge deflection. Glow plugs are just hooked up in parallel. Not in series like some tractors are. Don't know why someone had electric pump as filters and pump are strictly gravity feed on those. Make sure the return line is not restricted though. There is a check valve in return fitting under fuel tank and they can mess up. Purpose of check valve is to maintain a small amount of pressure in pump body for lube and cooling. Story goes with those check valves. One of first 560's we got in my boss let a guy try out on a demo. Well, it conked out on him in field, would only run about half speed with throttle fully open. Boss and I went out, determined return was restricted, we pulled check valve out from under tank. I stood with finger plugging hole in tank, boss takes elbow apart as the ball had gone through the spring, reassembles it,same thing happens in about ten seconds. We leave fuel return line loose and I drive tractor back to town, going down highway, leaking a little fuel all the way. About 15 miles. Farmer would not buy tractor. Ordered a new check valve, problem solved.
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