When I plug into the automobile power outlet (20 amp), it blows fuses. repair it or throw away?
If the inverter is blowing the fuse immediately upon plugging in the inverter (before you even plug something into the inverter) you most likely have a short in the 12V power cord. If you have an Ohm meter, you should be able to check the resistance across the two contacts on the 12V plug of the power cord. Wiggle it around some. If you get a very low reading, and especially if it's intermittent, you have a bad cord, which should be pretty easy and cheap to replace. My experience with these cords has been that their quality is pretty poor.
If that is the problem, maybe you can cannibalize a cord from an old CB radio, but here's a fairly heavy duty one on Amazon (they don't give an amp rating though)
http://www.amazon.com/Truckspec-TSPSCBH-2CP-12-Volt-Platinum-Replacement/dp/B001JT5QF0
Testimonial: "Al, the idea on the Powerline appears to be the correct solution. The R was very low as you predicted. I'll change out the powercord. Thanks !"
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