Here are some pages from various Ford Tractor manuals, the original 8N Operators manual; the July, 1947 Master Parts Catalog; the FO4 manual; instructions on wiring a voltage regulator; and a page from the 1948 MPC on wiring lights for 39-47. Note page 2 on the VR Instructions has a "How To Test Old Regulator First" to determine if indeed you need to replace your VR. All but the last page ( from the FO4 manual ) are for the original 6-volt system front mount 8N. The last page is a schematic wiring diagram for the side mount distributor as noted. All documents related to the original wiring of the 8N front mount distributor show the correct color-code and gauge of wire that is used. I can't speak for all wiring harness makers, but I got mine from Just8Ns and it was exact as original and fit perfectly. The wires are marked just as it listed in the manual- for example "Black with Red tracer".
8N-14401B Dash Harness-
8N Operators Manual-
8N MPC Electrical Wiring-
39-49 MPC Lighting Diagram-
Tim Daley(MI)
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