Re: Won't start.

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Posted by Tim Daley(MI) on February 17, 2019 at 05:36:14 [URL] [DELETE] :

In Reply to: Won't start. posted by Daniel Jinkens on February 17, 2019 at 01:26:49:

Dan –first welcome to the NTC. We need a lot more info to help serve you better though. What model of tractor are you talking about? Front Mount Distributor or Angle Mount? Is it 6V/POS GRN or 12V/NEG GRN??? An ammeter not reading right isn’t your problem but we’ll discuss that in a minute. You say you bought a new harness and then put the battery in backwards. Does that mean you connected it in reverse of what it was before? If still OEM 6V then you would have a generator and voltage regulator, or if an earlier 9N or 2N, a cutout. If you have a GEN/VR and battery polarity got switched, your gen would have to be polarized to match otherwise it ain’t gonna work. If 12V then you should have an alternator and no GEN/VR so polarizing is not done. See LINK below to WIRING PICTOGRAMS by JMOR for your setup and then use it to verify what you have and make corrections, no exceptions. AMMETERS are non-polarized. If OEM Induction (LOOP) style, the wire runs thru the loop. If readings are backwards –shows NEG/DISCHARGE when on, simply reverse the wire direction thru the loop. If you have the aftermarket style ammeter with two studs and screw terminals, then the wire is spliced and one end goes on one terminal post the other wire end on the other terminal post. If when ON readings are reversed, simply flip-flop the wires on the posts. It’s possible you have more incorrect wiring than just the ammeter. Start with getting the battery tested –the power source is a key to any electrical system. Starter shops can bench test it under load. They can test your genny, alternator, VR, ammeter and starter too. Concentrate on the wiring first, power OFF, doing continuity, not with an idiot light tester. Don’t just go by wires colors –todays cheap generic harnesses are not OEM color-coded like the OEM ones unless specified. Since you are a newbie I would suggest you invest in the essential manuals as well. The FO-4 and the 39-53 MPC are a good place to start. The 9N/2N Service Manual is in our MANUALS library as well as some of the original MPC's for free download. Here are the 9N/2N and 8N wiring diagrams. If you have a later 8N, NAA, or Hundred Series, they will use the side mount distributor and are wired differently as they do not use the ballast resistor -we can discuss further if that is the case.





Tim Daley(MI)

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