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Ford 9N, 2N & 8N Discussion Forum
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Need wiring diagram, help....

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Alvin Roberts (

01-22-2006 14:14:30




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I am just about ready to rewire my 48 8N. I have the resistor mounted behind the instrument panel, a 12V coil, two wire Delco type alternator. I guess the starter is original and I need to buy a new solenoid because the terminals on mine are rusty and stripped out. I might also mention that it"s the front mount distributor. I need a good wiring diagram so I can get started wiring it up. I am using a key switch with acc terminal. I would like to see how this system should be propery wired. Thanks in advance.

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Bob

01-22-2006 14:45:01




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 Re: Need wiring diagram, help.... in reply to Alvin Roberts (MS), 01-22-2006 14:14:30  
Go to the "My Old Fords site", and look at the 4TH diagram from the top.

It is perfect for your use, except you need to add Dell's "secret trick current limiting resistor" in the lead to the coil, 2- 1 Ohm 10 Watt resistors in parallel, yielding a 1/2 Ohm, 20-Watt resistor. DO NOT use the OEM ballast resistor with your "12-Volt" coil.

Use a "marker light", or an "idiot light" in the lead to the alternator's "1 terminal. Alternately, you can use a diode, such as a 1N5008, installed in place of the light, with the white banded "cathode" end towards the alternator's #1 terminal.

Resist the temptation to use the ignition switch's ACC terminal to provide the "excite" current for the alternator, without the use of a lamp or diode, as, although this does work, it is not what the alternator was designed for, and, under certain circumstances, can cause regulator and/or diode trio failure.

There are many options for the starter solenoid, however, unless you want to get into the electricals big time, simply get a new correct replacement for the original 6-Volt solenoid, and leave it connected to the safety "neutral start" tranny-top button. (For the intermittant use it's subjected to, a 6-Volt solenoid will be fine for this use.)

I would consider connecting the headlight switch to the other side of the terminal block.

This will eliminate the ignition switch from having to carry the headlight current, but will, of course, eliminate the convenience of having the headlights shut off with the key... you'll have to remember to turn them off!

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Alvin Roberts (MS)

01-23-2006 16:14:25




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 Re: Need wiring diagram, help.... in reply to Bob, 01-22-2006 14:45:01  
Thanks for the help with that. I believe I will use the diode or lamp rather than the ACC terminal. I guess the light would be better so I can see when it's charging. What setup do most people use...lamp or diode? If the lamp, what kind of lamp and where do you mount it? Again, thanks for the help and I'll get going on the wiring probably this weekend.



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