Tip - How to Make Trailer Lights Work Without Hooking Them Up to a Vehicle | eHow

How to Make Trailer Lights Work Without Hooking Them Up to a Vehicle. In order for the trailer lights to illuminate without actually being connected to a vehicle, they must be wired to a power source. To accomplish this task, connect wires to the positive and negative power leads of the trailer lights. If the trailer lights are modern and adhere to...