I am having some trouble trying to diagnose why the DC 15 AMP fuse keeps blowing. I have narrowed the issue down to the scare light switch in the garage. When that switch is turned on the fuse blows. Anyone have advice on how I can begin to resolve this issue?

FYI - We are brand new to RV'ing and have only owned this rig for less than a week. This switch was working when the survey was performed.

Thanks!