In Reply to: Re: Won't start. posted by Daniel Jinkens on February 17, 2019 at 08:32:39:
Your wiring is mucked up for sure. What did you use for a diagram? Like Jack said, reversing polarity on the battery would not smoke the wiring. You'd have issues with the genny not charging, but that too is no cause to smoke the wiring. Nor is an ammeter wired in reverse. The I&T F-19 manual is for the NAA tractor and a useful tool. JMOR's pictograms are also a very useful tool. The NAA 6V/POS GRN system uses the 20A/ B-Circuit type generator meaning polarizing it is different than polarizing the A-Circuit design and if not done correctly will smoke your VR. This is how the original NAA (Jubilee) & Hundred Series Wiring Setup looks:
You need the F-19 manual, 39-53 MPC, and JMOR's wiring pictograms to see the technical side of the wiring, meaning where each wire goes. Those manuals will also list the OEM correct wire color codes, but like I said earlier, you can't use colors if using a cheap aftermarket harness and also because colors do not conduct electrons. A continuity test is your best friend. Disconnect the battery and perform one before you smoke another harness. It is possible you may have fried the VR now, but root cause problem solving will determine your issue. You should verify the wiring is all correct before you connect the battery.
POLARIZING THE GENERATOR –B-CIRCUIT METHOD ON RIGHT: