Ok so I finally hooked up my license plate light on the 71 XR7. I used a 63 bulb, nice and bright but blew by the time I got home. Also was wondering, when I was putting different lights in, I noticed the lamp only worked when placed against the bumper, kind of like grounding it out. Was wondering if this is normal. So after the 63 bulb blew I put a 97 in, not as bright but does the job. Now only problem is after car sits for few hours. The battery is drained. Is this bumper grounding thing causing this? Is it even suppose to work like that?