in neee of dire help!

[86shorty]

Hey guys. So..I got my stereo system installed last weekend and it worked great up until a couple days ago it was popping fuses. The 15 amp radio fuse. I replaced with a 20..popped itagain. I wwasn't listening loud or anything and the speakers are stock replacements. I called the installer and they said the radio/lighter are on the same circuit and to unplug the lighter..so I did. Well..nothing happened. Plugged it back up..checked fuses again..its fine..but no power to my radio..horn or my cab light. Any suggestions? The soonest they can get me in to check out the issue is wednesday and this is driving me nuts!
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