On my coupe, when I depress both door jamb switches, the dome light dims. What could cause this? Bad headlight switch? Open ground somewhere? I replaced both door jamb switches and when I replaced the passenger side, the light finally went out when I closed the door. Last night, it came back on. I depressed the passenger side and now it's not working again. I think I may have an open ground on the passenger side, but I am not 100% sure. Can I check with a multimeter? Thanks for any and all help!