Why won't my AC/DC converter provide enough power?

So heres my problem... my car broke down on the side of the road, so I pulled it into a neighborhood and parked it on the side of the road, till I can get it fixed/towed. 4 hrs later police department calls me and says I have one day to move it or they're gonna tow it. I need to replace my catalytic converter,... show more So heres my problem... my car broke down on the side of the road, so I pulled it into a neighborhood and parked it on the side of the road, till I can get it fixed/towed. 4 hrs later police department calls me and says I have one day to move it or they're gonna tow it. I need to replace my catalytic converter, so I got ac/dc converter, a dremel tool to saw the old one off, and everything I needed, BUT everytime I turn the dremel on my converter displays a red light and shuts its power off. the ac/dc con. puts out 125v, and the dremel takes 120v, my car battery is completely charged and the conv. is supplying enough power so whats wrong?
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