Nearly burned my daughter's jeep to the ground just now.
It's been in the garage not driving for the last little bit, doing the stereo (I was slow and not motivated due to the rainy weather & other competing interests). Go to start it today, battery is dead. So I go to jump it off my Lexus. Here's the thing, the battery terminals aren't labeled, and by now you know where this story is headed. One of the terminals has a black cover, although that cover wasn't on the terminal, it was hanging off to the side of the battery, So I think "black cover, gotta be the negative terminal."
I hook it all up and i know something is wrong because the headlights didn't turn on in her jeep. Then she goes "dad something is smoking!!" And she wasn't kidding. I ripped the cables off the jeep battery and prayed that the smoke circuit would finish up ...for a hot second I debated getting the fire extinguisher.
Anyway, that's when I figured out that the black terminal cover has a small red (+) on the other side. Luckily no damage done. I'll do a more thorough inspection of the wiring in that area, but it seems like we're ok for right now. Once corrected, it fired up no problem and we drove it for a little while.