I had a problem with my battery on my 06 K9 and needed to get a new one well before I did I borrowed a battery from one of my Hd's and stuck it in the Dog to see if it would start it. Well like a DA when I put it in I didn't pay any attention to the fact that the HD battery had the posts opposite than the BD battery and for a brief second caused the wires to be hooked up backwards red on neg black pos! when I went to hook it up it threw a spark and the lights came on horn blew with the ign switch in the off position! I only had it crossed for a second and pulled the wire but now after Igot the brand new battery it does the same thing, as soon as I go to hook up the battery the headlight comes on, horn starts blowing like it is sending power everywhere at one time! HAVE NO IDEA what damage I did but something is DEF f-up!:bang:

