Can the electrical system be fried if you hook up the battery backwords (poles reversed)?
<br/> I'm asking this because after taking the battery for a check at Advance Auto Parts, they offered to charge it. But when I took it back to the car and hooked it up (correctly) it sparked and everything went dead. I took it for a check at a specialized battery shop and they showed me the poles are reversed. Plus is actually minus and vice-versa. I told the guy the whole story and he said the guys at Advance Auto Parts reversed the cables when they charged the battery.
<br/> Could this be possible?
<br/> Is my car's electrical system fried now, and how can it test it? I checked all the fuses and they're good...