2002 ford ranger edge 4.0

hi so I bought the truck for $550 and I practically stole it for that price body is in great shape frame is perfect. But the truck has a transmission slip so I got out my snap on scanner and tried to run it through tests for injectors and tranny but when I plugged in the scanner it wasn’t getting any power from the ob2 so I grabbed my key programmer that can run scans and it wasn’t getting any connection to the ob2 either the guy put in a new motor so I’m wondering if he forgot to connect it to something or if maybe he’s pinched or knocked the wire when he put it in. I need to get a test light out and check if the ob2 is getting power but where can I find a wire guide do I can trace the wires and see if any are cut. Or any possible reasons it won’t work Thanks greatly appreciate

 

Cigarette lighter and OBDII port get their power from the same fuse

 

+1 ^^^^

In 2002 ranger its Fuse #17, 20amp, in cab fuse box