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Hey Greg:
The center console in your 74 is identical to mine in my 78. Is every thing disconnected? You got some work cut out for you if thats the case. My advice to you is to remove the center console top and find all the wires. With parking lights on and ignition off you should see three bulbs on in the center console. One is for the illumination above the heater/defrost control levers. The other two illuminate the little orange square def and wiper location indicators. Above the radio the green light should be on. When you turn the ignition key to the on position another light will illuminate and then go off after about 5 secs. That bulb goes to the brake indicator above the shifter. Another way to illuminate that light is to pull one of the two pairs of the red and black wires off the brake master tank and touch them together. In the upper dash above the radio, there are four lights. The green illuminates w/ parking lights. The blue w/ bright lights. The left red w/ low fuel pressure. The right red w/ low oil pressure. On the heater switch trace them back to the heater fan assembly beneath the center bottom of the dash behind the center console. I don't remember the colors for sure. I believe a couple of yellows and a black. Heater and wiper switches have low and high speed. You should also have a reostat that adjusts the intensity of the center console lights and its located on the center console between the heater and wiper switches. I hope this helps some and gets you started. If you get hung up, drop a line.
Best Regards,
John M
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