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Restoration & Repair Tips Board

1939 Ford 9N Wiring

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Jakester

01-07-2007 04:50:43




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Helping a friend with his resto. Tractor was running when resto started. It has the newer 3 wire 6V genny and newer style Voltage regulator. Points are new and gapped properly. Condenser is NOT new. Coil is a Taiwan replacement-not original. Battery, all wiring, and battery cables are all new and sized properly. Had an intermittent spark at the lead in wire to the coil but now it is gone. I'm using a test light on the lead in wire to the coil to check for voltage. Obviously there is no spark across the points. Didn't have any when I had weak spark at the coil either. All ground connections have been cleaned to make a good connection. I have a PDF file of the way I wired the tractor if that will help identify the problem. I used the routing on my 1947 2N as a guide along with the Ford Manual-although the manual is somewhat confusing to me! My 2N has a different VR and has the single wire genny. Not certain of the correct placement of the wiring on the VR and genny either as there are no markings on either unit. I thought the ARM was on the end of the genny and goes to the ARM on the coil but not certain which post it is. Also, can't identify the field and gnd on the genny. I don't think the genny/VR wiring would affect the starting though. Any help from the pros out there would be appreciated. We really want to listen to this thing run!

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Dan

01-08-2007 14:09:26




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 Re: 1939 Ford 9N Wiring in reply to Jakester, 01-07-2007 04:50:43  
I will assume you are certain this is a 1939 9N - because they are normally wired differently than the other year 9Ns and the 2Ns. Lets start with the basics - you should have a small jumper going from the hot side of the starter button on the top left side of the dash ( NOT next to the shifter) to a ballast resistor block and connected to the single bottom terminal on that block. Then a lead runs from that single terminal to the ignition swith, then out of the ignition switch to one side of the ballast resistor. The other end of this ballast resistor should have a lead that comes off and runs to the top of the coil. If you unhook the lead from the top of the coil, turn the ignition switch on, you should have around 6v at that coil lead. If not - either your wiring is wrong, your ignition switch is bad, or the ballast resistor is shot. Tracing voltage to each side of all contact points with a meter should show you where the voltage stops, and where your problem is.

Good luck,
Dan

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old

01-07-2007 09:02:15




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 Re: 1939 Ford 9N Wiring in reply to Jakester, 01-07-2007 04:50:43  
One way to narrow down where the problem is, is to hot wire it. Run a wire from the battery to the coil and see if you have spark. If you do then you know the problem is from the coil back. If you don't then you know the problem is in the distubutor. Don't leave it hot wired long or you can/will burn out the coil.

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