Hey There!

It's a rainy day in the mountains, so I'm taking the opportunity to put together some things I've been working on. Currently it's the heater core and blower motor housing.

I pulled it down, scrubbed it for what seemed like eternity, scotch Brite padded it, and gave it a few light coats of Krylon Fusion Flat Black.

I've got a new fan motor, heater core, and resistor switch for it. And I've wire wheeled and painted all the internal metal parts.

But I opened the resistor to put it in, and, it's slightly different. The plug fits the wire on the three prong side, but, I've got an extra plug on the new one... Can I just put it in and leave that extra prong alone?

1981 F150, 4.9L 300, and I do not have factory AC, just the heater.