I've got some electrical issues with my '77 F150. The brake lights aren't working and right turn signal doesn't work with headlights on. I would like to check grounds first. I've found one in rear of truck but can't find the rest. How many are there and where are they?

 

Not knowing the engine installed, battery ground went to engine block. Engine also had a bonding wire between engine and firewall. If an eight cylinder, look behind carb between intake manifold and firewall. A cable about eight to ten inches long.

 

Thanks for the help. I should've included the 351M motor and 4wd. I had assumed that there were some grounds along the frame or body somewhere. I've looked at the diagram but it didn't give specific locations.