- Oct 28, 2021
I am going to run a 12 volt starter on an old mechanical diesel farm tractor I have with 24 volts. The positive on the front battery goes directly to the starter solenoid + terminal. The front battery is not grounded. The rear battery is grounded. There is a mechanical solenoid between the two batteries that when engaged will send 24 volts to the starter. My question is can I run 12 volts to the solenoid with a momentary switch to engage the gears and at the same time connect the front battery positive to the starter through the same solenoid? Well I guess I already know the answer to that is yes. But what happens when the mechanical solenoid is then activated? To start the tractor I would be holding in the momentary switch and then activating the mechanical solenoid. After the tractor is started the front battery would be grounded and the batteries would be wired in parallel through a DPDT switch or two solenoids that are activated. There would be a run and a start circuit. The tractor has just a 12 volt charging system and lights. Is there a better way to do this? Any other ideas/questions?