here is a generic hook up of the relay. if you have any questions, post back here. those terminal numbers you see should correspond to a typical automotive relay. the bottom terminal is where you have to choose the activation type for the fog light relay. if the fog light relay is activated by 12+, then you want this relay to send 12 (+) to the fog light relay. if the fog light relay is activated by ground (-), then you want this relay to send it ground. you MUST choose one or the other, not both. make sure you verify the terminal numbers with the relay you buy. visit www.the12volt.com for more information on how relay's work. remember, this is only advice. i take no responsibility in any incorrect wiring you do.