90 40WB Will Not Crank Over

[joedana0502]

I have a 1990 40WB that will not crank over. No voltage at the
ignition switch. I have one red wire and the rest of the wires are
those small rigid black wires. One of the black wires has 7 volts on
it and the rest of the wires have 0 volts. Does anybody know which
wire should be the hot wire and where does it come from before it gets
to the ignition switch. The batteries are all good. Thank for any help.

Joe Blankenship
90 40WB
Phoenix, Raining