Metra RL3040 12V 30/40 Amp Relay (1)

most aftermarket relays actually come with a handy little wiring diagram printed onto them somewhere top on this one side on this one and that actually shows you how you need to wire it that diagram on the relay actually has numbers on there that correspond to pins on the bottom of the relay most relays do have these pins labeled on the bottom so they will tell you which pins are going to what part of the circuit so the terminals you have our 30 85 86 87 and 87 a in the case of a 5 terminal relay you won't have that in the case of a 4 terminal relay start off with number 30 number 30 is your high amperage load side that's your battery power that comes direct from your battery to the relay I do recommend putting fuses on the air personally I often use an inline fuse you can pick up cheap little inline fuse holders a lot of places I've been continuing on the load side we have 87 87 is you