Coil pack wiring

goast1993 · Dec 17, 2023

Alright, here’s the deal. I have a Foxbody mustang and need help with the coil wiring.
I don’t have the stock harness as the car had it removed before I bought it. I’m running a terminator X harness. So my question is, what is a good way to wire the coil based on all the info above? I know the negative side of the coil goes to the dizzy (unless I’m wrong about that) but I can’t just put it on a switch can I? Any help would be greatly appreciated

TOOLOW91 · Dec 17, 2023

It’s simple and in the manual . The harness you unplugged the old engine harness from on the driver side coming out of the fire wall - has a red with green tracer wire in it that’s where you can tap for the key on power for the coil .

Depending on the year car I can tell you what wire in the same plug is for the tach .

If you have an msd box there is a different diagram . Let me know if you need that

If you don’t have the Holley harness this one is a little nicer and fully shielded . If not the Holley one is fine

8693_tfi_adapter_harness_holley

www.mfkustoms.com

goast1993 · Dec 18, 2023

TOOLOW91 said:
It’s simple and in the manual . The harness you unplugged the old engine harness from on the driver side coming out of the fire wall - has a red with green tracer wire in it that’s where you can tap for the key on power for the coil .

Depending on the year car I can tell you what wire in the same plug is for the tach .

If you have an msd box there is a different diagram . Let me know if you need that

If you don’t have the Holley harness this one is a little nicer and fully shielded . If not the Holley one is fine

8693_tfi_adapter_harness_holley

www.mfkustoms.com

I must be having a different issue then because that is how I wired the coil like the diagram. Either bad grounds or a bad coil. I have the coil wired into a switch that’s for the ecm. Idk why I’m not getting any spark otherwise

TOOLOW91 · Dec 18, 2023

goast1993 said:
I must be having a different issue then because that is how I wired the coil like the diagram. Either bad grounds or a bad coil. I have the coil wired into a switch that’s for the ecm. Idk why I’m not getting any spark otherwise

What switch for the ecm ? If it isn’t hot while cranking and running the car isn’t going to start

I have had a Holley in my car since 2017-2018 and have wired many of them so the more specific the easier it is to pinpoint

goast1993 · Dec 18, 2023

TOOLOW91 said:
What switch for the ecm ? If it isn’t hot while cranking and running the car isn’t going to start

I have had a Holley in my car since 2017-2018 and have wired many of them so the more specific the easier it is to pinpoint

I have a terminator X stand alone ecm. The coil is tied into the same power supply I send to the ecm through the same switch. I’m getting voltage to the coil. But no spark through the dizzy on cranking. I hope that makes sense

TOOLOW91 · Dec 18, 2023

goast1993 said:
I have a terminator X stand alone ecm. The coil is tied into the same power supply I send to the ecm through the same switch. I’m getting voltage to the coil. But no spark through the dizzy on cranking. I hope that makes sense

You have verified voltage to the coil while cranking ? White wire is to the negative side of the of the coil correct ?

You did a tps auto set correct ?

Did you go into the settings a select tfi ignition as well via either hand held or laptop ?

Sapper713 · Oct 8, 2024

Did you ever figure it out? I’m having the exact same issue. On page 10 of the instructions it talks about installing a relay for retaining the OEM coil which conflicts with the figure 1 diagram.

Coil pack wiring

goast1993

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Coil pack wiring

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