hey, so ive got a 1989 f250 and the #8 fuse keeps blowing and i am unable to figur eout whats causing it. I disconnected the door jam plunger switch and that allowed me ot liten to my radio for a couple days (just no door buzzer or courtesy lights would come on) then the fuse blew again and i lost my radio. i am trying to narrow down whats causing this issue. i put a dome light bulb into the #8 fuse spot and started to disconnect the radio and dome light. as soon as i disconnected my aftermarket radio (which i did isntal myself and have checked all wire none were touching or rubbing anywhere and hte radio has worked great no problem all year) the light turned off. so moved on and i plugged the plunger switch back in and hte light came back on. so i took off teh whole dome light assembly and disconnected the door buzzer and the light still stays on. what else can i look at to see why its shorting out?