I have a 2004 standard softail. When I connect the neg wires to my battery, I get a spark and a whizzing sound coming from my speedometer for a second. the speedometer needle also twitches for a second then stops. I have pulled the 15 amp fuses to isolate the noise and spark and found the fuse for the battery, when removed, stops the spark and noise. however, all the lights go on when I turn switch to start but the push to start the bike is disconnected by the removal of the battery fuse. There seems to be a drain on my battery, but when I took the bike to a dealer, they said there was no drain. What is causing the spark and noise from speedometer?