John Deere 650 wiring issues


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John Deere 650 wiring issues

Eric I'm attempting to help a friend work on his 1980's JD 650. It appears to have two, maybe related issues. 1) The battery is not being charged. Purchased new battery and still not charging. 2) Short in the wiring someplace.

1) I read 14VAC & 0VDC with my multimeter coming off of the alternator.

2) The indicator fuse blows instantly. Interesting to note that I have continuity between ground and ALL of the fuses except when I turn the electrical knob from off to any of the light settings.

Are their wiring diagrams available online for this tractor?

Thank you, ANY help would be appreciated.

Brice Stultz jljlj
Jim Neitzel You are correct to have AC off alternator, as it is basically a 3 phase generator. The regulator on the firewall converts it to DC and regulates it. I have had to replace 2 regulators on japanese engines. I would say if you get AC on all 3 leads from alternator, the regulator is probably junk. They seem to run $50 to $85 depending on the seller. I have seen quite a few applications for the same regulator. so it pays to shop around.


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