When its time to hit the open road and you need more space than the saddlebags and tour pack can offer, you may want to purchase a trailer. Heck, you can put a sleeping bag along with a whole lot more in one of those. Although some would argue that a trailer isolator is not needed, we beg to differ. The isolator takes power directly from the battery and grabs the signal from your brakes, running lights and both turn signals. This process sends those signals through a bank of four relays before it sends it off to the trailer. The relays draw power from the battery and not your o. e. m. turn signal module, thus, preventing premature module failure. A factory turn signal module is a few hundred dollars making these isolators a worthwhile investment.