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Old 03-19-2004, 01:28 PM
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56 ford ignition wiring

I am rewiring my 1956 Mercury (Ford) M-100. I have already bought a new after market, GM style harness and have most of the under hood wiring done. When I went to wire the remote ford solenoid, I followed the original wiring schematic, but I am confused by the actual operation of the solenoid and whether it is correctly wired. I don't want to put power to it and have something blow up!!

I have made the following connections:

1) Battery to solenoid
2) Solenoid to starter
3) Start wire from ignition switch to "S" terminal on solenoid
4) Ignition wire from COIL SIDE OF COIL RESISTOR (coil pos+)to "I" terminal of solenoid.

My question is: in step 4 the schematic shows the ignition wire going to the coil side of the resistor. Is this correct or should it go to the input side of the resistor? What is the reason for this wire?

Also, for information sake, How exactly does this solenoid work. I like to know why as well as how to solve my problems.

Thanks allot. This is my first post, and hopefully not my last. I've learned allot just reading here.

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Old 03-19-2004, 03:43 PM
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When you energize the solenoid, you close the contacts between the big wire from the battery and the big wire going to the starter. Why are you using a GM style harness?

If it has a GM starter, you will have to energize the GM solenoid on the starter also. or the starter won't operate.
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Old 03-19-2004, 04:27 PM
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Perhapse "GM style harness" was misleading. Aside from the color code wires and some connections, It is a universal aftermarket harness.

This merc is stock restoration, and so is very simple to wire so far (knock on wood). Because it is a stock ford, it uses the separate solenoid on the firewall to engage the starter. My confusion comes in when connecting the "ignition" wire from solenoid to coil power. Does this wire need to be connected to the input (full 12V) side of the coil resistor or the output (less than 12V) side.

Because this is points type ignition, I understand the need for the resistor. The only thing I am confused about is why is this "ignition" wire needed and second, does it need 12V or less than 12V.

I hope this is as clear as mud now. Thanks for any help you can give me.
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Old 03-19-2004, 05:41 PM
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Arrow

Quote:
4) Ignition wire from COIL SIDE OF COIL RESISTOR (coil pos+)to "I" terminal of solenoid.

My question is: in step 4 the schematic shows the ignition wire going to the coil side of the resistor. Is this correct or should it go to the input side of the resistor? What is the reason for this wire?
This circuit bypasses the ignition circuit resistor while starting.

When you turn the key to start, the ignition switch sends current to the starter solenoid ("S") to close the circuit between the battery and the starter motor. It also momentarily energizes the ("I") terminal to supply battery voltage (12V + ) to the coil for easy starting.

When you release the ignition switch, the starting circuit opens again and there is no battery current supplied to the ("I") terminal. The coil then draws it's voltage via the resistor (9V) to prevent point burnout.
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Old 03-21-2004, 01:32 PM
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Thanks for all your help guys. It now makes scense. I'm glad I could get such a definite answer so quickly.

You guys rock, I hope one day I can repay someone else here with some of my knowledge.
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