Quick history. New to me 2017 Case 9240 combine, close to 1300 threshing hours. Has been running good. Monday night all of a sudden the motor starts surging, stop do a walk around, everything looks fine. Try again, same thing happens. First thought has to be a fuel filter. Drive back to the yard, change out the primary one down by the fuel tank. Go back to the field, make one pass runs fine, starts again on second pass. Call it a day. Tuesday, check air vents on fuel tanks for plugging, are good. Check flow out of the bottom of each tank, good. Replace secondary fuel filter on the motor. Off to combine. Runs perfect all day, must have been the problem. Gets dark, turn on the lights, one pass and starts surging again, wtf. Turn the lights off, runs fine, turn lights on, surging again. But here is where it gets really baffling, first position on lights, no chopper lights, no tank light, 2 less cab lights, runs fine, position 2, turns on those lights and combine surges again. So where to start looking. Suddenly both my son and I remember the tank light wasn’t hooked up when we bought the combine, seemed odd. It ran fine for about a week with the light hooked up. Long story short, disconnected the tank light, runs like a top. Local dealer is baffled, as no where in the wiring harnesses do the light circuits cross the fuel shut off or ECM power wires but they could be wrong. Most of my machinery issues nowadays are electrical or sensor issues. Bearings still go but not nearly as often as electrical wires.
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Oh boy I believe you.
Mine takes a notion to randomly pick an ACS setting that we can't even find and max the fan and sometimes close the sieves.
Don't bump that little air restrictor sensor on the air filter housing. It'll break and cost you $2500.
On our fourth warranty on header lift valve.
Good t know about the tank light lol.
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