Need help identifying electrical part on John Deere 850 tractor

[Tx Jim]

If you sign up on JDparts.com, you can look up all those parts. You can also see the (usually high) prices.

Your CH12806 regulator is $233.53.

BTW, welcome to TBN!

Parts are cheaper at my dealer.CH12806 REGULATOR ADD 214.25 USD

 

[Quattro]

Try jumping your tractor from your car or truck. See if this works. If it does, you don't have enough cranking amps but you have voltage.

Jumping didn't help, got new battery, that's when we started our crude diagnostics. There is lots of juice in the system, it's just not flowing through a critical part of the circuit

 

[Quattro]

I would venture that part is not in the starting circuit. You may be just moving a loose connection in the safety circuit or the fuse box. On our 1050 has an intermittent problem with one of the neutral safety switch. When it is not making contact it is just like you are describing.

The neutral safety switch and PTO safety switch have been bypassed. Doesn't sound like a good idea to me, but then, it's not my tractor.

 

[Quattro]

Parts are cheaper at my dealer.CH12806 REGULATOR ADD 214.25 USD

And I repeat myself:

"Interestingly enough, when I Google the part number you provided, CH12806, all I get is solid state regulators that look nothing like the tin box that's in this tractor or the unit pictured in the JDparts diagram. I wonder if they changed from a mechanical to a solid state regulator on the 850 at some point? "

Also, the solid state CH12806 is easily avialable on line for less than $50.

Quattro

 

[JD755]

And I repeat myself:

"Interestingly enough, when I Google the part number you provided, CH12806, all I get is solid state regulators that look nothing like the tin box that's in this tractor or the unit pictured in the JDparts diagram. I wonder if they changed from a mechanical to a solid state regulator on the 850 at some point? "

Also, the solid state CH12806 is easily avialable on line for less than $50.

Quattro

As shown in my post number 10, there were different part numbers for the regulator through the years. Deere does not always update the picture in their drawings when they change a part like that as long as it still fits the same way. I see those solid state ones available for around $50 and they look to be probably what Deere did change to, or at least is what their suppliers now provide as replacement parts. How old is the serial number of your tractor?

 

[Quattro]

JD755 wrote: "As shown in my post number 10, there were different part numbers for the regulator through the years. Deere does not always update the picture in their drawings when they change a part like that as long as it still fits the same way."

Thanks a lot for pointing that out!! I looked at the diagram but failed to note the string of part numbers assoiated with it. Duh.

I don't have the tractor's serial number, but I'll forward this information to my wife's uncle who owns the tractor and who will be at the ranch this weekend.

I'll update as I find out more.

Thanks again,
Quattro

 

[Mechanos]

You know the key switch on this and many other tractor that use the same is known to fail quite regularly. Pull the connector off the switch and jump the appropriate terminals in the harness connector.