Wiper wiring 3-speed '74 dart sport ?

Plugs into the firewall connector, is one of the three.
Hi, I have the firewall connector w/ all 8 pins containing a wire - but all info I find state there should be 4 wires from the actual motor, not 5 ? Those three I asked about have no colors , just an asbestos sleeve, difficult to diagnose w/o color ? Plus why 5 wires ? Thx