I know that too much voltage can cause damage to the electrical system but what type of damage can it cause. Before I changed alternators mine peaked at 18+ volts and I have no idea how long it was bad. Could this high voltage damage a battery or cause ecu problems that wouldn't through a code. My old engine was running flawless then it went dead barely running. I put in a 66000 mile replacement a6 from a wrecked si and it was flawless but now at idle its going poop poop poop out the exhaust pipe. I have no hesitation and during deceleration in 3rd gear it causes more popping noises. I guess I'm just wondering what things I need to recheck to make sure this winter will go good. I had been using a ecu from a 88 si and after I changed back to mine it seemed to get better but I don't know these problems are all intermittent here now but gone at lunch time.

 

I think it'd jsut blow fuses.....isn't that what they're there for?

 

I was thinking that but the manual said something about electrical system damage so I wanted to make sure. My big problem is just my paranoa. I always find some problem with it but my wife seems to think its running fine so I've been letting her drive it. (she keeps the tank full) There is probably no problem just my imagination.