I tried to reassemble one once...disaster...

If your truck has the 2nd type of flasher unit, then it will work on 12 or 24 volt and it is all solid state so no relays inside...nothing to worry about.

There are several things in the Online Maintenance Manuals section with info on what original wire goes where and how power is routed...if you cant find something you need, please ask...I can find it...