kubota F3560 out front mower

[David stair]

Hi all, recently had to replace the stop coil on the diesel engine. There is a ECU that supplies power to the 2 coils in the stop coil. It is called a stop coil on the kubota electrical diagrams
It is used as a start and run coil, so the coil (has 2 windings) is 3 position, one coil give start position provides extra fuel for starting, the 2nd coil provides the normal fuel supply for normal running, both coils de-energised for the engine stop.
I am not getting voltage to the run coil from the ECU, so the engine starts then immediately stops. I have wired the run coil strait off the auxially 12v circuit. Now the engine runs fine, except the energised coil is getting somewhat hot. Does anyone know what voltage the ECU supplies to the run coil.

 

[kubot4nicalgard3ns]

The Kubota stop coil circuit usually gets 8-10V DC from the ECU to keep it cool. If you run it at a full 12V, it'll overheat. So, check your ECU's output or use a voltage regulator to bring it down to the right level.

 

[MA_Pahn]

Running that run coil off a straight 12 V line? Not smart... that's what's frying it. The ECU delivers just 8–10 V to that coil, keeps things cool, so your workaround is basically cooking it dry. You either need to fix the ECU output or drop in a small voltage regulator to bring it down. Otherwise you're in coil-replacement territory fast.