MTGreen
Platinum Member
- Joined
- Oct 12, 2022
- Messages
- 980
- Location
- Montana, USA
- Tractor
- Deere 5220, Ford 1720, Deere Progator 2030
Well it seems like there's only a couple things it can be at this point. Since the starter is new and your positive battery cable is new and you ruled out the possibility that your battery is putting out good voltage but no amperage: either the ground circuit to the battery negative is inadequate or the starter solenoid and motor are not actuating together because they're disconnected electrically or inappropriately shorting. I think the inadequate ground scenario is more likely. You said you connected a wire from the plate that the starter is mounted to to a wiring harness ground on the block. What about the block to negative terminal connection along with the chassis to negative terminal connection?
Excessive resistance in your ground circuit causes a voltage drop per ohm's law. It doesn't take much power to free spin the starter so it is conceivable that inadequate grounds could spin the starter without actuating the solenoid.
The other thing I would try is not jumping the terminals to try to start it and use the ignition switch instead. There's some variation on starter wiring setups and there also can be some variation on interpretation of what jumping terminals means to folks. This can eliminate additional variables
Excessive resistance in your ground circuit causes a voltage drop per ohm's law. It doesn't take much power to free spin the starter so it is conceivable that inadequate grounds could spin the starter without actuating the solenoid.
The other thing I would try is not jumping the terminals to try to start it and use the ignition switch instead. There's some variation on starter wiring setups and there also can be some variation on interpretation of what jumping terminals means to folks. This can eliminate additional variables