Today I will be showing you how to install the electrical relay on your Kawasaki Vulcan S step-by-step. This is a very easy installation and only requires a few basic hand tools. You will need to install the electrical relay on the Vulcan S if you want to install the 12 volt adapter, extra bar lights, or gear indicator. This is not an expensive product from Kawasaki and it is very easy to do at home, so don't waste your money at the dealership on this one!