Dave, What in the world are you switching? I have use Potter Brumfield power relays in the past with good results. The Newark catalog (#113) shows a automotive relay on pg544 P/N VF7-11F11 or VF7-41F11 (~$8.00 ea) that are rated for 70A continous and 12VDC coil. It looks like these are about the highest rated amperage that Newark carries. Russ, 87 5KTQ