Heater blower wiring

[Desert68]

Hi Everyone!

I'm new to the forum but have already learned a great deal from others on this forum. I recently purchased a 68 C-10 that is in pretty good shape. It's an Arizona truck, and always has been. It doesn't need major work or anything, but I have been fixing a lot of minor problems like wiring, etc.

I'm working on the heater now. It didn't work when I bought the truck. I checked the orange wire that comes through the firewall and connects to the blower motor and it does have 12 VDC on it. The blower switch and the resistor are good. What is missing is the ground wire for the blower motor. Mine doesn't have one. I saw a picture of a motor on this forum, but couldn't get enough detail.

Can someone please tell me how the motor is grounded at the motor connection specifically?

Thanks!