I went to install a Tricon switch today and and I'm confused. Got the horn wired up as per the instructions and diagrams some nice person posted. From the bike side I have a white wire, 2.5vdc. The Brn Blk goes to the horn. The remaining wires Blue Red the Blue White and the Blue wire all show 12vdc when connected to the battery. I get no readings when grounded to the frame. Have another brown wire that doesn't get used. Am I stupid? Seems this should be a 15 minute fix. What is the white wire for?