Boooooyaaaaaaahhhh people. Thats what Im talking about. The mystery red and black wire goes to the alternator.

The starter was wired up properly. The ground that was in the harness on the other side of the engine was loose.

The ground bolt was the last bolt to bust my knuckles on for that truck. Iam soooooo stocked. After that. The truck fired right up and the new engine runs like a champ. So greatful.

Thanks for everyones help.

Rdogg

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2000 Ford Ranger 2.5L 4-Cylinder Bang bang.
Single Cab, 249,000 miles. Just did an engine swap.

Upgrades and fun begin.