I have a 1968 convertible too. I have read lots of threads on here about the system and it's problems. The up/down switch seems to be the weak link in the system and requires replacement often. The above article is what convinced me to use relays. I have opened and cleaned my top motor and found the commutator to be very dirty and I polished it while it was apart. After that it worked much better. I also used new rams. I used the stock up/down switch to test the top and found my hinges were old, dirty and causing too much load. I oiled them all and after that the top moved smoothly. While bench testing the motor I found the load to quite high. The wires I was touching to the battery made a big spark when connected. I did not measure the amps but I would guess the load was sizeable. What I am doing is using high amp relays to operate the top motor just like in the above article. By wiring in some relays back at the motor, and using 10 gauge wires to power them, the load on the switch becomes very low as all it is doing is powering the relays. I also read about DC switches and why they are different from AC switches. A very high amperage load can actually cause the contacts to weld together. For that reason DC switches are built much differently than AC switches. I also found a DC switch rated at 50 amps and is a mom on- off- mom on three position toggle switch I can use in place of the stock switch if it still fails. I am also putting in a power seat so it will also use the 10 gauge line for power. So rather than worry about the stock switch burning out why not just use the relays?