"The difference between and engineer and a tecnician is that an engineer can tell you why something works. He can't however, tell you why it doesn't work."

I installed an external oil cooler in the coach when I replaced the engine. Because there was no way to get it into the airflow, I installed a cooling fan, and as I always do, polarized the spade connectors on the wires, and of course, bench-tested the fan.

That old fan became erratic, so I installed a new one, with the bench test and polarized plugs. Energizing the circuit, I inserted the fuse, and it blew. "Dang," I thought, "tightened 'er up too much and the blades are stuck on the fins." Nope. Bad fuse? Blew another 15A on a fan that drew a measured 7.25A.

Now I had been trying to beat the rain so I was in a rush; the threat of rain having passed, I crawled under again, and discovered that someone had blythely connected the two fan leads together. And of course, the same for the hot and ground wires...

Thou art a bigger man than I...

Keeping polarity straight gets kinda tough when you are lying down and reaching up while trying to see. I try to use color coding whenever possible.

However, I don't really remember my excuse, but I did the same thing on my engine puller fan.

Hello, My name is Ed and i have hooked up wires backwards on occasion.

Hello Ed, you are welcomed here... As a recovering "On Occasion Cross Wire Installer" myself, I would be proud to be your sponsor.

We don't issue chips here, but we'll take your word for it anytime you want to admit you screwed up.

BTW: We do serve adult beverages to help coax your blunders out into the open.

Thanks Bill, nice to know i have someone i can call if my wires start sparking or smoking when they shouldn't.