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Crimp connections for larger splice joins

Practical Motorsport Wiring - Professional Level

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Hey all,

I am nearing completion of my Actuator Harness. Only part I have left is the coil pack portion of the harness. I am splicing 1x 16ga to 4x 18ga per cylinder bank to power the coilpacks. The yellow striped closed barrel crimp is too small for this splice join. I have the large open barrel crimps, but unfortunately, I do not have the proper tooling to crimp this particular crimp (part number 62357-1). Is the 3187 CT crimp tool sufficient for this join, before I go to order one (which of course they are out of stock most places).

Alternatively, am I able to reliably use a solder sleeve for these larger joins? since they will be contained within a sealing boot and sufficiently strain relieved.

Any insight would be greatly appreciated!

Thank you,


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Hello i have no problem with using solder but I'm sure the purists amongst us will put a hit on me for saying this,

Regards Ross

4x18 + 1x16 is ~= 1x10awg. It's not very big, a 10awg splice and crimper can handle that no problem.

What coils do you have? You can probably be fine with 20awg, in which case a 12awg splice would probably work.

I am running stock GM, LS3 coils, but would like to prep for IGN1A coils, in case I decide to upgrade.

I tend to cascade crimps when necessary, however in DFI scenarios I'd tend to agree with Matt. You should be fine with 20awg given your duty cycles.

We usually reply within 12hrs (often sooner)

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