This doesn't add up. You're saying that while the light fuse is blown or pulled out, the engine won't start? Can you verify that by starting the machine, then cut it off, and pull the light fuse. Will it start?
Unplug the fan, and pull the light fuse, and then check resistance between the fan and the light circuit. Sounds like you have a low resistance short.
Ouija Board and crystal ball are both on the fritz, so unfortunately you're going to have to troubleshoot it. :tongue: