There's a ground going from your negative battery terminal to your chassis. That ground is the right in front of it. Then there's one gong from the back of the engine block at the BOTTOM of the engine block that goes to the chassis. I just know of those from doing the "Big 3" which can be found here: http://www.ranger-forums.com/f59/how...system-102462/
Thanks! I was aware of the couple main ones but didn't know if there was anything else around the cab area that I was missing. If it helps at all the issues I've been having are to do with the door locks and speakers.
Battery to chassis
Chassis to motor or vise/versa, usually the same wire from the battery to chassis.
Engine to body, usually on the rear of the motor.
Sometimes but not sure if in the Ranger, body to frame.
There should be some info on grounds listed in the Ford Wiring Diagrams Manual for your year truck. I got one on Ebay for 10 bucks for my 2001 Ranger. Theres usually a few to be found there. They are a huge help and good for planning your projects. Lots of info on connectors, switches, etc.