[hog]

There are 4 or 5 seperate ground wires that need to be connected to the frame. Be sure you have no corrosion where they connect. Usually when you have an odd problem such as you state it is a bad ground. To activate your dimmers (high-low beam) if you have the Painless harness there is a White/black wire in the turn signal harness that is momentarily grounded to activate the relays that dim the lights. The white/black wire and a black wire should be connected to a switch which is normally open. When pulsing the switch the lights will change state.
hog