They are usually a buss fuse and it's in the adapter. I was a dumba$$ the other day when I blew mine. I bought a 3 plug multi adapter a few weeks ago, (radar detector/phone charger). Then I bought a 100 watt power inverter and it said, clearly...do not plug inverter into multi plug cig outlet, what did I do? Not only did I blow the multiplug fuse, I als blew the 15amp fuse on the fuse box
