4020 JD

gerald johnson · Nov 15, 2010

new purchase 67 4020 24 volt system,oil sending light, the bulb works, oil presure sender in the block works but I can't get the two to work together?

buickanddeere · Nov 15, 2010

It's two 12V systems. One - to chassis and the other + to chassis. Lights and instruments are 12V, some - and some +.
24Vgen,regulator and starter have no current path through chassis.
Wiring harness drawing in the JD electrical service manual.

msb · Nov 15, 2010

Check to see if there is a small ground wire on the left side battery (rear post)and if it is in good condition.It might have a slo blow fuse in a fuse holder that is blown.

VicS · Nov 15, 2010

You won't believe this but 30 yrs ago my brother took two delco alt and welded them together, and hammered out a longer center section. One charges the left batt 12 volt neg ground and the other charges the right batt 12 volt pos ground. The lights on the left side are pos ground and the lights on the left side or neg ground, the dash lights are divided up the same way. The alt still workes. If it ever quits we are going to convert the tractor to 12 volt neg ground.

VicS · Nov 15, 2010

I know I've got two Lefts but you get the Idea,

4020 JD

gerald johnson

New User

buickanddeere

Well-known Member

msb

Well-known Member

VicS

Well-known Member

VicS

Well-known Member

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