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24 volt update

8

8850dave

Member
Well I figured out why my fuel gauge would not work, I couldn't get power out of the new gauge from Evergreen Restoration. I called Jerry when I couldn't figure out thr gauge sender deal then he reminds me the left battery negative terminal goes to the starter solenoid then I look at the JD service manual and it says the same, but my oh negative wire was hooked up to the post on the side of the starter and the rh positive cable feed the starter solenoid and it's been this way as long as I've had this tractor. I switched the 2 cables and low and behold the fuel gauge works and I start it up and even my charging system is charging . So thus far this 24 volt JD 4020 has survived.
 
Back on the 10th I wrote "For starters, the power terminal on the gauge (likely labeled "IGN") should measure (-) 12 Volts (nominal) with respect to the gauge housing and tractor chassis with the key switch "ON"."

I was wondering if you checked that, but you didn't deem it worthy of a reply.

Turns out I was right, doesn't it?
Previous ost
 
That's my point. I told you way back then you needed -12 Volts at the terminal that powers the gauge.
 
The simple things are the hardest to fix. Everyone of us here has jumped over the obvious while looking for the big problem. How many 24v systems have been converted to 12v because it's cheaper than fixing those simple problems.
 
It is easy to understand why the 24V 4020 gauge is that way:
On gas versions, the tractors are -12V negative ground, so the Diesel 24V has to be negative ground for the instruments.
 
Gas tractors are pos. ground and so are the JD fuel gauges. That's why you can't just stick an aftermarket fuel gauge in as they are all made for neg. ground.
 
860 wrote:

"It is easy to understand why the 24V 4020 gauge is that way

On gas versions, the tractors are -12V negative ground, so the Diesel 24V has to be negative ground for the instruments."

Or rather, the gas versions are POSITIVE ground and the gauge power circuit on a diesel with 24 Volt is POSITIVE ground, as well.

In other words, as I previously wrote, the power terminal on the gauge is at NEGATIVE 12 Volts with respect to the gauge housing and the rest of the tractor chassis.
 
"How many 24v systems have been converted to 12v because it's cheaper than fixing those simple problems."

How much does it cost to pay attention and connect up the batteries correctly vs. a changeover to 12 Volts?
 
And don't take for granted that the dealer will give you the correct gauge and sender, it is a Gray area for them,, for the 24 volt system it will take a RE54427 Gauge, and a AR26434 sender,, the sender is the same for 12 volt, the gauge is different
 
You have it backwards. The gas tractors were
positive ground until 1969. That's why you
have to replace the fuel gauge with a negative
ground one when you convert diesels to 12V neg
ground.
 
"Bob, are you getting cranky in your old age?"

wila, you "nailed" it.

I AM getting OLD and I am CRANKY.

Dunno why I bother to post here.

I posted some factual info for the OP and he chose to ignore me/it and not do the simple check I suggested, prolonging the "issue" he was dealing with.

I have NO problem with being told I'm dumb or annoying or to go micturate up a rope, but posting factual/sensible advice and being IGNORED is a whole other scenario.
 
Yes, I knew the gas tractors are opposite as usual with positive ground. I just said the opposite.
 
Anyway, just wanted to bring up the fact that if you are familiar with the 12V gas tractor of the same area, the 24V seems quite a logical setup.
 
Looks like Bob nailed this one correctly. I earlier posted just general info about how on the Deere 24 volt hybrid system A and B feeds, Pos and Neg 12 volt with respect to chassis, were fed up to the dash in order to try and balance loads with some 12 volt loads fed from one 12 volt battery A and others the other 12 volt battery B, BUT HE EVEN ACCURATELY DESCRIBED WHICH SOURCE (+ or - ground) FED THE GAUGE IN QUESTION to help the poster. He and TX Jim and the good Buick Deere Man (who gave a 24 volt seminar at Two Cylinder Expo in New York) are good to have around

John T
 
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