Need help wiring up electronic ignitor

iboaterlurker5

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Apr 2, 2021
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Factory wiring setup is attached.

My old coil went bad so I installed a new coil (1.5ohm) flamethrower I coil. (PerTronix 40111 Flame-Thrower 40,000 Volt 1.5 ohm Coil).

Per the instructions the coil wants to bypass the external ballast resistor. So I removed the ballast resistor from the circuit.

I have the orange wire running from the starter solenoid (i) terminal straight the coil's positive terminal. I have the violet wire running straight from the alternator to the ignition terminal on the terminal block.

For the ignitor I was running red wire to + terminal on coil and black wire to - terminal on coil.
The distributor is a prestolite distributor has no negative or grounding wire (I assume it grounds itself through the block/shaft).

When I move the key from the off position to the run position (not trying to start yet (4 pole key switch), the distributor ignitor instantly burned up. I know you aren't suppose to leave the ignitor in the run position very long (I didn't, only about 2 seconds before it started smoking before I could even engage trying to crank it) because given a minute or two it can burn up from constant 12v.

Where did I go wrong? Should I not source power for the ignitor from the i terminal of the starter solenoid? Should I leave the ballast resistor circuit in place for the alternator also? Does the alternator still need that resistor? It is same model number alternator as in the diagram.
 

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GA_Boater

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This belongs in another section. What are you working on?
 

Scott Danforth

Grumpy Vintage Moderator still playing with boats
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The distributor. Trying to not burn up a second electronic ignitor that replaces points.
and what kind of motor is the distributor installed on, and why are you not following the pertronix instructions?
 

iboaterlurker5

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and what kind of motor is the distributor installed on, and why are you not following the pertronix instructions?
I followed the pertronix instructions at least I thought I did.

ford 460 marine engine with prestolite distributor, coil listed above with everything really fed from the starter solenoid setup as per the wire diagram I attached. The pertronix calls for a 12V non-resistance signal that is keyed from the "run" key switch. The original setup uses a 12v wire send from the I terminal on the starter solenoid, to a ballast resistor that then connects to the coil. The new coil has internal 1.5ohm resistance and thus the ballast resistor isn't needed per the pertronix instructions. So I bypassed the resistor/completely removed it from the wiring diagram, wired i terminal from starter solenoid straight to the coil. The i terminal is only hot when the key is in the run position. However the ignitor is burning up instantly for some reason and I can't figure out why.
 

iboaterlurker5

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Apr 2, 2021
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I figured it out, the I terminal on the starter solenoid is really only used during starting to bypass the factory external ballast resistor and put more voltage to the normal points distributor during start-up. I think this was causing my ignitor to fry. I moved the ignitor directly to a key ignition source instead even though the I terminal was key ignition also.
 
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