Thought we were done restoring this 1980 diesel Ford 445 tractor. Having problem with new alternator output only 12.28 when idling and same volts when increase rpm. Put new wire harness D6NN14A103J from Sparex Ag Parts #S.67792, new 32amp Alternator D5NN10300ER, and new regulator Model 8RH2023 4 amp 12 volt D7NN10316B. Hooked everything up as wiring diagrams and manual says but alternator only puts out 12.28. Took alternator to a Shop and had tested, alternator is good. Did a Regulator bypass test via Service manual (disconnected field lead from F terminal on alt, connected jumper wire from R terminal to F terminal and took reading at idle and also at increased rpm) and alternator increases output to 14v+ when increase rpms with regulator bypassed. Bought another new regulator thinking I got a faulty one but same issue. So, I am pretty sure alternator is good, regulator is good, wiring harness is new, but could the wiring be wrong? I followed wiring diagram with wire harness to alternator: black is ground, blue is R regulator, red is F field, red w/ eyelet is Output. I am at a loss and need to get this tractor done. Any input is greatly appreciated. Ready to say screw it and get a 1 wire alternator. Anyone know a part# for a 1 wire alternator that will fit Ford 445 diesel tractor?