I have a client who can't figure out the 1969 blower motor wire routing. The Osbourne Assembly Manual is terrible, and it looks like the blower motor wires originate in the engine compartment. The ground wire stays in the engine, and the power lead looks like it passes through the blower motor firewall grommet or hole back to the engine compartment where it plugs into the heater box resistor wire block. Can anyone confirm the routing of the power lead?