You really need to go to http://www.elec-trak.com/. A bunch of great people with lots of infor about the elec-trak. I wouldn't recommend going to 48 volts on it. you are dealing with 40 year old parts that are setup for 36 volts. The traction motor can handle it but i don't think the deck motors can. As for making the lights work, they are run off of 2 batteries in the back box at 12 volts (there own light weight wires). you will also find a wires to run the front lift at 18 volts. Again go the http://www.elec-trak.com/. they have service manuals, wire diagrams, and at least 2 different dealer for parts.