Easy peasy my young friend....
Under the drivers door, on the chassis, are two ground points fr circuit looms...
Remove the two bolts,,,,clean the chassis with rough sandpaper, cut off each end connector fitting and replace with SOLDERED ends to the original wiring...
Then under the hood, at passenger side rear of engine, there is a ground strap between engine and cab...replace it....
Then trace battery ground from battery down to engine then chassis...renew both leads with factory leads...
Now, under the main fuse panel remove the loom plugs and clean them with electronic contact spray....
Finally, fuel tank filler ground wire to tank then to chassis...make sure its in excellent condition....
These trucks are renowned for BAD GROUND circuits....
Have fun...
