Keep generator or replace it on 4020?

Rapidrob

Member
I've been busy tinkering with my '68 4020 Propane and for the most part got it running very well.
This tractor still has it's original generator installed. There are five head lights. The four original type on the fender lips and one in the rear shining on the implement.
At 1,000 RPM Plus, with the lights on, the voltage meter ( brand new) drops to 12 volts. with the lights off the voltage is just over 13.7 VDC.
The lights do not go bright/dim as engine speed changes. Is the voltage dropping normal or does the voltage regulator need to be adjusted?
Should I change out to an Alternator? If so which one should I get? What is involved in doing the upgrade?
As far as I can tell the only current use are the five lights and the ignition.
 
I think I would go with an alternator. Especially if you want to pull any equipment that also has lights. Should be a pretty easy conversion to go to a Delco 1 or 3 wire alternator and change to negative ground.
 
I don't think those generators put out much more than 10 amps at full RPM, the tag on the generator may specify the output. If you run mostly full RPM, and the generator is in good condition, it should keep up with all the factory electrical loads on the tractor.

Are there problems with the fuel gauge when the polarity is changed from positive ground to negative ground?
 

While I am a purist and recommend the 12V 20amp Delhi generator for two cylinder Deere’s.
The new generation looks just fine with a high output Delco alternator . Bigger is better .
While one wire is simpler, three wire operates better .
 

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Back
Top