I had a similar issue with my 1863 when I got it.
http://onlycubcadets.net/forum/showthread.php?t=18242 The PO said he had been having trouble getting it started. When I was fooling around in the dash making a rod for the hydro I found two red/black wires had come out of the switch. I think you can see the empty connector on the switch in the picture. Check the connection on these wires.
Cannon