Which coil?

Dana67Dart said

You can plug a 4 pin into a 5 pin harness, the 5th pin just sits there and is not attached to anything.

You can not go the other way.

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Right. I realize that. But the original 5 pin harnesses had a propensity for issues. I've seen several myself. I would just change it. Just my personal opinion. But we all know I'm mentally ill.