I have a carson power inverter that keeps blowing the 12 volt dc fuses. The only fuse amperage that lasts is a 20 amp. These are ATO fuses. heres the story. the lights in the pop up camper haven't worked since I got it. never really cared to look why. I was looking at it and saw the fuse was blown and that is was a 20 amp. went got a 20 amp, plugged the converter in and the lights worked. I was stoked until today when I plugged it in and no lights. looked at the fuse and it was blown. heres what I have done for tests. I checked voltage at the fuse holder and it says 14.4 VDC. I have a DC amperage test function on my multimeter and it says 10 A DC. I have to switch one of the leads on the multimeter to use this function. I hooked it into the holder and the the display goes blank because its above the range. I tried some other size fuses before this and it popped a 5, 10 and I tried another 20 and that lasted about a second before it popped. why did this work before for about 3 hours until I shut it off and now it wont work at all please help.