When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Power from battery to 30amp relay. Swicthed source to relay(can be found at ignition coil). ground to relay. Power from relay to switch. ground to switch. Oh, put a 20amp fuse on the power from the battery.