
I do think that this could possibly be an overload of factory wiring to stock light switch and would use a heavier wire to feed the switch? This would be the way I would go as it is much cheaper. The first pull turns on the brakes and voltage reducer, the second pull turns the factory lights on as normal. Several carts in the park are using a HD light switch with 3 wire set up. Most carts key switches are not heavy enough to handle the increased flow so I went the expensive route and added a additional 48 volt solenoid that draws only a minor load hooked to my NON FACTORY KEY SWITCH. My neighbor had a minor fire because his cheap ( CHINESE ) unit that was ON all the time overheated, thankfully he had a fuse on his 48 volt pack that saved his cart even if it was way too high a amperage? I would add a fuse low enough to protect in line from power source to the reducer.

Any of the voltage reducers I have seen the instructions say not to leave connected all the time, but add a switch to control? There are so many different units out there that you should take each one by its installation instructions.
