4020 voltage regulator , how do i polarize, positive ground

ronny.clift · Nov 28, 2018

I was told on a 4020, 24 volt with positive ground to polarize by jumping battery post to arm. Did this and it would not spark. Have replaced generator and charging light still on.
How do I determine if voltage regulator is bad?

Bob · Nov 28, 2018

Yes. to polarize, momentarily jumper "A1" (labeled "GEN") at the voltage regulator and the regulator terminal labeled "BATT".

To see if the generator works, jumper "A2" and "F", you are "full fielding" the generator and it should be outputting over 30 Volts measured across "A1" and "A2".

John T · Nov 28, 2018

FYI The 24 volt components IE the Starter and Generator are two wire insulated/isolated off case/frame ground and are certainly NOT Positive ground as your post said, you're not the only person who mistakenly proclaimed the 24 volt system was Positive ground so don't feel bad lol Do as Bob noted to Polarize the Generator. Then when running at fast RPM and the genny is full fielded like Bob told you essentially taking the VR out of the equation if she don't charge its a Genny or wiring problem NOT the VR...??..

John T

4020 voltage regulator , how do i polarize, positive ground

ronny.clift

New User

Bob

Well-known Member

John T

Well-known Member

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