I was trying to check, sand, and retighten all seven grounds on the truck, but only found six. Does anyone know where my missing ground is?

I found:
2 on the firewall- one drivers side one passenger side
3 near the driver's side battery
1 near the hole for the air filter

Which leaves one,....somewhere

 

Mine has a ground strap between the cab and bed.

 

We have a winner....

Its actually a very good idea to go through all grounds, make sure the connection is good, maybe clean off the oxidation, and replace the ones you can (cab/box for sure). Bad grounds can cause all sorts of problems...especially on the third gens.

 

2 on the firewall- one drivers side one passenger side
3 near the driver's side battery
1 near the hole for the air filter

all the above are 5/16

The one between the cab and bed is a 10 mm

Plus I found one on the starter.

Hopefully this thread can help someone else who's checking grounds in the future. Thanks Break Away and Dr Evil for the help

 

Missed the one on the starter

 

Do you guys use a wire brush or sandpaper? And do you paint over the freshly cleaned and re-attached grounds to keep them from corroding?

 

Wire brush is good for getting the crud/dirt of the connections, and if it is a real stiff wire brush you can really clean the connection good. Use the sandpaper to clean the surface, basically you want a bright and shiny connection. The stiff wire brush can sometimes get the bright shiny surface, but I find the sandpaper better for that purpose.

 

I painted the first six

 

If you want to be really cool, add a dab of di-electric grease to the contact surfaces. That stops the water from creeping in there.

Jim