Medium and Heavy Trucks
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I see all kinds of diagrams on internet, but this seems to be a good one. Linked above. Be sure the generator/regulaotr is polarized, or it will not charge.
Field controls the charge, the armature post on the generator is the output and has to go to cutout relay. And the L is the load, which goes to the ampmeter. Do you have any output from generator above battery voltage? Is tractor still posiitve ground?
Have you polarized the system?
Ammeter will just read backward , if wires are wrong, swap wire and it will read correct in other direction.