Ok I have a 94 dyna that I have bought 99 hand controls for. Will they just wire up or are there some modifications that have to be done for them to work. I have been looking at the 94 wiring diagram and 99 wiring diagrams and they are slightly different for the blinkers and horn.
Thanks

 

I doubt that they'll plug up directly without moving some wires around. If I'm not mistaken, both the 94 and 99 model years used the Deutsch connectors but the pin outs are most likely different.

You're on the right path, just trace the wiring diagram and move the pins as needed to make everything match up.