Wiper switch to motor wiring

[gmachinz]

Indeed 73-77 are different both in function and color codes. I had to sort through a lot of differences before designing a pulse/delay integration wiper switch harness to allow a 78-83 style pulse switch to be used on 73-77 trucks. It require the swap to a 78-up motor and the corresponding linkage arm. The switch opening on the dash needs slightly enlarged too then it's plug n play-this refers to pulse/delay installs on 77-older trucks tho, dis-regarding the 1977 only style delay switch delay setup.