1972 Superbeetle- can't keep a stereo working in it. Help!?

Question

I have bought two car stereos (pretty good ones from Walmart) and each one of them has worked fine for a month or so, then it suddely dies. Won't power up at all. What could be the problem? Coincidence or not?

Answer 1

connect the electric directly to the battery with an inline fuse.

Answer 2

take them back keep recipt, and  go to another store....

Answer 3

Use a tester to read voltage a the source...theses cars are weird,so check and make sure you have at least 12v at the red and also the yellow wire with ign. on from the back of the stereo.