when i got my 77 it had no bed and the wiring harness was sticking out the back. so i found were all the wires went. except for the backup light. there is one wire left but it doestn work so im guessing this is my backup light. but why dont it work. the tranny was changed from a 3 on the tree to a granny four. is there somthing that could be missing?
On a 3 speed, the backup light switch is mounted on the column. If you switched to a granny four you need a backup light switch on the shift linkage under the truck. Bruce
