Anyone put on an Acerbis headlight? I picked one up for my '99 WR 400 as a replacement and I'm not sure how to connect it. It has three prongs (flat and in a row) coming out of the back of the light. My WR only has a 2 wire plug. Do I just connect the two wires to the two outside prongs on the headlight? I assume the third is for a highbeam option. Any ideas? Thanks.