wiper and top wiring questions

I'm wiring a 1950 new yorker convertible. converting it over to 12 volt, as well as a 500 cube big block.

two quick questions.
1. anyone have a schematic for the stock wipers?
2. the top is electric, and has a 30 amp in line fuse to the pump. I'm thinking that 18 gauge should be plenty to run it. correct?

thanks
Michael

don't have wiring for that year
but
30 amp should have a 12 guage wiring!!!