car wont start after i replaced the starter that was installed in april '12. on 2002 Ford Taurus

after the new started was installed i drove it to 3 or 4 places then it wouldnt start and all other power was gone too. had the starter tested and it passed but i got another just in case. also replaced the fuse to the starter relay. is it wiring or just a FORD?

Asked by for the 2002 Ford Taurus
This may be dumb question, but have you checked the battery and the connections? Now, when I say check, I don't just mean look at them, but actually remove the connections, *thoroughly* clean the terminals, inspect the wires for corrosion damage, and test the battery out of the car. I can't tell you how many seemingly enormous problems that come into the shop turn out to be nothing more than a bad battery connection or faulty/missing ground.