If you hooked the terms up backwards I feel bad for you. Did you see a big spark? And you probably just fryed your starter. I did this once way back in the day when I was first learning about cars. Cost me 300 to get what I needed fixed and for a tow truck to come out.

Edit: I'm confused. It still starts? but won't turn off?

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GOLDIE
1999 2.5L XLT
Herculiner | Kobalt tool box | K&N Filter | 6k HID's | 31's BFG | Eagle Alloy 186s | 102'' Whip | Cobra 19 DX IV | Fabtech 3.5 Spindles | Pro Comp AAL kit | 15% Tint | Mustang Dome