Can a wire gauge be too large?

I do know that you can have too big of a connector. Father-in-law changed out the blower motor on my wife's car, before we got married. Blower always ran slow. After we got married, I decided to unwrap the bundle of electrical tape he had on it(golf ball size) and see what was going on. He didn't have a solderless connector, so he pulled one off of his lineman work truck and used a large one used to connect overhead power lines! Changed it out and motor ran at regular speed after that. I guess it was a huge resistor.