You need 2 SPST automotive relays (30+ amp). Try to get relays with harnesses since its a lot easier to wire up. Use a proper ground for everything. Also please you a proper fuse for the 12+ volt line with this formula.
FUSE AMP RATING = (TOTAL WATTAGE / 12)
http://www.vertsoft.com/images/jdmheadrewire.jpg
Note that the relays have to have a Normally Open and a Normally Closed terminals.