Attempting to re-wire heater switch. Pulled switch from 1974 Fj40. It has 4 spade male plug, female half missing. Connected Blue wire/Red stripe to same on male. I have power. I have Blue with black stripe and Blue with White coming from blower. No matter which way these are switched only can get high speed and off nothing from low. Is there another colored wire missing from PO as i can only find 3 wires newby to site post. Have read a lot of great posts from past for info. Please help if you can thanks.