In Reply to: Polarizing Generator posted by Gary on January 09, 2021 at 10:52:44:
First, are you talking about a generator or an alternator –you mention both and there is a difference so which is it? To answer your 2nd question first, NO! Polarization is done with NO POWER applied. Polarizing can be done internally on the generator as well it is just easier to do with the VR when all are mounted. The rattling noise you heard was probably a worn out bearing in the GEN or badly worn brushes rubbing on the commutator. Your shop rebuild guy should have fixed this then tested using the 6V/POS GRN setup and it would have set polarity on its own. Next, JMOR is the resident electrical guru around here and has diagrams and text to show correct wiring. You need your ESSENTIAL MANUALS, OEM Owner Manual and I&T FO-19 or FO-20 Manual to use as references. It's important you should know what your electrical system consists of and operates on. There are two circuit designs on generators, the 'A' Circuit, and the 'B' Circuit -see diagrams below. The first early 9N, the NAA, and all generators after used the 'B' Circuit design. Polarizing each circuit is different and if using the wrong one on a 'B' Circuit, can fry the VR altogether. The NAA, 600, 800, and 900 Models all used the 20-AMP; 'B' Circuit Design; 3-Wire/2-Brush Unit with a Voltage Regulator -see drawing. Either way, GEN or ALT, you need a fan belt tensioning device attached in order to charge the battery. Do you and how well do you know how to use a VOM? Just curious, how do you determine it is FORD unit?
FORD OEM 600/800 OWNER-OPERATOR’S MANUAL:
FORD NAA/600/800/900 TRACTOR ELECTRICAL WIRING:
POLARIZING AN “A” CIRCUIT DESIGN or “B” CIRCUIT DESIGN:
-Diagrams courtesy of JMOR