There is no reason to buy somebody's expensive kit- - - - -60 amp 12 volt Bosch type relays are cheap and plentiful on Ebay and most of them come with the plug-in sockets included. No, you don't need a 60 amp relay for headlights, but the wires they come with are bigger and have less resistance. Run a HEAVY (like 10 gauge or bigger) main power source from the battery cable connector at the starter to the radiator core support. Fuse it if you wish- - - -a 40 amp maxi-fuse should work well. This is going to be where the relays get their voltage, so no switch will be needed. Use new connectors at the headlight bulbs and connect them to the relays with 14 gauge wire. Run the same size wire from each headlight connector to a good ground like the frame- - - -don't rely on front end sheet metal with years of rust accumulated to provide a good ground. Use the signal from the dimmer switch to trigger the relays, one for high beam and another one for low. Connect the relay coil grounds to the same place you ground the headlight bulbs. If you want to hide the relays, just put them on the forward side of the core support, with the wires going through a rubber grommet. If you really want to see well, use LED headlights, not conventional incandescent ones or even halogens. The relays will handle the current load without a problem.
Jerry
