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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

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  #391 (permalink)  
Old 04-08-2014, 07:37 PM
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If it is the original resistor it should work. If you set it up so that it would run off of the battery but use the resistor instead of the wire it won't run?
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  #392 (permalink)  
Old 04-08-2014, 09:16 PM
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If you're hooking the module to the S on the relay, that's not going to work (as you're finding out).

The S terminal is fed power from the red/blue wire and is hot when the key is in START (and the clutch/NSS (if installed) is closed). This activates the electromagnet inside which closes the two large contacts together and thereby feeds power to the starter motor; it also feeds power to the solenoid's small I terminal (if applicable).

By crossing the battery and the S terminal, you activate the solenoid and feed the starter, you also power the ignition module but only until you release the starter. So, the behavior you're seeing is a exactly correct for how you've wired it up.

The module receives battery voltage in START on one wire and in RUN on the other wire, this is determined in the ignition switch. (The power in one wire in START tells the module to retard the timing.)

The coil receives full battery voltage in START and reduced voltage (via the resistor) in RUN.
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  #393 (permalink)  
Old 04-09-2014, 08:23 AM
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OK, so how do I "mimic" the ignition switch?
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  #394 (permalink)  
Old 04-09-2014, 09:11 AM
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Go back to your drawing and put a jumper from battery positive to coil positive. That will let you start it with a screwdriver. When that works then use the resistor in place of the jumper and see if it runs.
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Old 04-09-2014, 09:42 AM
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Thanks to everyone helping me figure this out. I know the thing runs and runs good, that's enough for me right now. I'm getting very frustrated trying to run it without the proper setup,meaning the factory harness and ignition etc. I'm going to drain the coolant, replace the freeze plug again, and put it in storage so I can keep going forward.

When the time comes (body is done) I will plug everything in the way it's supposed to go and go from there.

Thanks again
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Old 04-09-2014, 09:42 AM
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