Do they still have the spade connectors on the end? If they do, the larger one is positive. If not, come back and I'll find my diagram.
<span style='color:gray'><span style='font-family:Courier'>1995 e36 3 Series RIP
1999 e46 3 Series BURN IN HELL
2000 MR-S Roadster= Current</span></span>