How about using a solid state relay? Low power ones can be purchased for pretty cheap. Im gonna run this plan past my electrical engineer friends and see if we cant solve the noise problem.
Your diagram looks good to me. I like where your head's at with this idea.
2004 Silver Birch w/moonroof. "Isabelle"
Eaton swapped summer/fall 2015 with all the gooddies, tune by the one-and-only Marty-O +2psi pulley, Steigemeyer stage 6 port, SWLT, custom ss exhaust, Borla ProXS, Addco sway bars, TCE s/s brake hoses, Hawk HPS pads, Zack big brak kit, J-mod, battery in trunk, full custom audio (never used, blower whine sounds better)
To do list:
HID headlights, LED interior/exterior, courtesy "3-flash" turn signals, widen wheels, rear deck wing, marauder stencil on cmhsl? bumper cover inserts? deck lid, steering whee, hood liner godshead, more power!