Mounting the accessory needs some consideration, especially if the new gizmo dislikes rain, heat or vibration. The manufacturer will usually suggest an appropriate mounting point. If at all possible, follow this advice. Likewise, if the device needs to be insulated from vibration, believe me, resist the temptation to bolt it solidly to the frame just because you think it'll work better. Many high-current accessories require relays. Relays tend to be weather-sensitive, so mount them in an out-of-the-way, dry, secure area, like in the headlight shell, under the tank or seat or in a fairing, if possible. Of course, all terminal connections should be protected with dielectric silicone grease, especially if you're an all-weather rider. The same goes for any add-on switches. Mount them securely mounted and protect them from the elements.