New Owner , and need heater wiring help!

[john husband]

Thanks in advance for any info. First, someone gutted the heater system, radio , and lighter, basically everything altogether in my 1970 C10.
I have a few questions for proper re-installation of the heater system. I have all the parts: wiring harness, heater housing,controls, fan etc., but looking through the Clymer manual I am a little confused about how to deliver power to the wiring harness at the control section and like i said before it was gutted.
Since everything was essentially cut out I need advice at how to get power from my fuse box to the controls. Second, there is a red "hot" wire left but it doesn't clip into the slot on the heater wiring harness which Im assuming may be for the lighter, but Im not sure.Could I use that by just putting on a new connector?. Or should i run power from the fuse box or is this how it was powered originally ? Just getting into this bad boy and loving it, but need some advice!

Note: There is a brown wire that has been clipped, a grey wire, and two wires leading from my wiper motor(yellow and blue).
Any advice would be great...winter in Oregon needs a proper heater!