Join Date: Aug 1999
Location: Ontario, Canada
As for your dash lights, check all the fuses, the little short one is for the dash lights, it will only have power on both sides when the lights are on. it gets power from the tail light circuit.
On the heater motor, On your heater box there is a plug with three wires. This plugs into a series of resisters, for the various heater motor speeds. Unbolt the resister block and check the condition of the resisters, and the wire conections. You should be able to use a jump wire and bypass the resisters to check the heater motor operation. If it still does not run, a seperate ground wire to the motor, try a dirrect line to the power terminal of the motor, to check if it works. If not you are in for a nasty job replacing the heater motot if it is any thing like a 68.