Re: fuse or no fuse

I think a fuse, or better yet, a circuit breaker is needed. When using a battery that can provide sufficient current to jump start a car, its possible to melt the insulation off small gauge wiring if/when a dead short happens. An insulation meltdown can happen in an instant. Been there, done that. I initially installed a fastblow fuse on my system. Unfortunately, the first time I connected the SLA battery to the charger, it sparked as I connected it and blew the fuse. Major bummer. So I replaced the fuse with a circuit breaker and have had no problems with the circuit breaker tripping if/when it sparks when connecting it to the charger.

Re: sealing the Optronics driving lights.

There is a rubber seal on the back hole where the wires go through and it effectively keeps water from coming in. The lights can get quite hot and I think any condensation inside the housing will evaporate. The only sealing I've done on my lights is to use two pieces of metalized tape (the kind that is used to seal heating ducts) to hold the bezel on. The bezel has a tendency to pop off. Which it did on my first ride after installing the lights.