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Yeah it sounds to me like something is going on with that sensor. There are 2 wires coming out of the sensor, so I would suggest tracing those down to make sure there are no issues there. Do you still have your old sensor? Was it working before it was removed? If so, I would reinstall it to...

I suspect the issue is your new glow plug sensor. That sensor, and that sensor alone, controls when the glow plugs come on and when they go off. When the engine reaches a certain operating temperature, the sensor causes the glow plug circuit to shut down. They are currently cycling off and on...