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24v battery wiring to starter on 1960-1965

Neither. The 24V generator,24V regulator and 24V
starter float isolated from chassis.
Half the lights are +12V and the other half of the
lights are -12V.
Do you have a wiring diagram?
A 12V conversion will work if no shortcuts are
taken. There are some 4.0,4.8 and 5.0KW gear
reduction starters on ebay.
The new Delco 44MT should fit too.
24V is fine if maintained properly.
 
ok, well if i put the negative on the starter soleniod it puts the supply wires to light switch as ground wires, so im thinking maybe positive should go to solenoid then the light switch works, but would this shortout the generator and regulator?
 
Don't touch anything without a diagram,otherwise
the smoke will leak out of the wiring.
Two separate 12V feeds supply the light switch.
Has anybody cut from or added to the wiring
harness?
The center point between the batteries is
connected to chassis with a fuse for protection. it
carries unbalanced current if there is an odd number
of lamps.
 
2 supply wires work when i have the positive on the solenoid, the light switch works too, but when i have the negative on the solenoid the 2 supply wires to the light switch become as ground wires, yeah seems wires have been cut or added
 
You ask...."is this a negative ground or positive ground "

THE ANSWER YES

The starter and charging system are two wire 24 volt ISOLATED from frame ground devices.

The starter has 2 posts, one wires to one battery, the other connects first to the solenoid then (when its closed via the solenoid) to the - of the other battery i.e. 24 volts isolated from ground operates starter.

Approximately half the 12 volt lights are fed from one battery (at + ground) while the others are fed from the other (at - ground)

The mid center tie point where the batteries join in the middle (+ of one to - of other) is tied to frame ground i.e. one battery is Positive grounded 12 volts while the other battery is - grounded 12 volts..

Got it??????

John T
 
Pos on starter body stud and neg on starter
solenoid.
Good luck however without a diagram and tracing
every wire and connection as something may not be
as it left the factory.
1-800-522-7448 for the service manual and
operators manual. Odds are some clod lost the
operator's manual.
pos and neg both go to the light switch.
Remember chassis is not negative.
Unless you have fire insurance on the tractor,
shed and other equipment. Obtain a all new wiring
harness and instruction from Jim at Agri-services.
A 44+ year old wiring harness has insulation
that is rotten from age, oil, moisture, manure and
small gnawing animals.
 
(quoted from post at 22:06:10 04/28/12) serial number is all the numbers on the plate 4020 21T85939
Click to expand...

1964 65000
1965 91000

Your 4020 is a 1965 model. You can look these wiring harness diagrams up on your computer. Granted they are for a 4010 but very similar. Here's another schematic. www.geocities.com/gwece/deere/
7497.jpg
 
(quoted from post at 17:10:16 04/28/12) There are some 4.0,4.8 and 5.0KW gear
reduction starters on ebay.The new Delco 44MT should fit too. 24V is fine if maintained properly.
Click to expand...

An Iskra starter will also work at a lot cheaper price. I disagree that a 24V system is fine if well maintained. All things equal the batteries on a 24V system have a history of giving more problems than on a straight 12V system. I don't ever remember starter brush dust grounding in a 12V starter such as it will do in a 24V starter.
 
so which battery goes where? does positive go to solenoin or does the negative go to solenoid and how is the battery hook up? does 1 positive go to negative on the 2 batteries? cant see that on diagram
 
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