I won't be much help. but I will try. I replaced wiring harness on my 54 and at the same time went from an add on box with a cancel button to the aftermarket chrome lever that operates more like regular turn signals with manual cancel. Personally I don't really like it as lever is too short and is quite a reach with large diameter of steering wheel. When I first installed turn signals would light both lights thru the stop light circuit. basically, you end up breaking stock stop signal circuit and running it thru the turn signal switch. as far as not flashing, I was fortunate enough that flashers had already been wired in on my truck and it matched the wiring diagram so I just cleaned it up with new wires.