what part of a car can easly damage if you put a wrong polarity battery on your car,?

Question

is there no protection on the alternator

Answer 1

I haven't made that mistake, but you might not hurt anything except the alternator. You really need to get an answer from somebody who actually did it.

I have not seen protection against this on an alternator. That might be a better question if you asked specifically about a certain type of car. I would think they're not all exactly the same.

Back before cars had alternators, you could reverse the operating polarity of the whole car and it was no big deal. I've done that. Nothing on the car that's resistance operated knows the difference. Any motor that has permanent magnets will run backward, but there aren't any in a car! The old generators had permanent magnets and field coils both, so that was the only thing that didn't work right. You'd have to rewire the generator to get it to charge at full rate. But again, before you did that, it wouldn't send much amperage anywhere at all. No danger. Obviously cars didn't have computers on them in those days.

Answer 2

What's going to happen is a several possibilities..
You're going to short out your battery.
You're going to possibly backfeed a mass amount of juice heading the wrong way into the car computer, it will probably flow faster than the fuse can react. You'll probably blow several fuses.
You can have your wires smoke & break within the sheathing.
your starter wires might have fusable link, those might be damaged.
as for the alternator, some cars put a fuse on it, it's a waste of time, the amount of power flowing will blast past the fuse before it can blow and stop the flow.
as for the alternator, you probably would fry the rectifier assembly (or diode pack).

There's really no reason to protect against something like this because while yes, this does happen more often than one might think, the manufacturers assume you'll be going to the dealership for all services anyway, and allegedly, that doesn't happen there.

Answer 3

Near the battery is a "Main Fuse Box" that should protect the system from a battery being hooked up backwards! Every fuse in that should blow (burn) before damaging the system. some the starter may take a direct jolt from the battery and "At the Least" burn out the solenoid on the starter if not the starter. If the new battery you installed was big enough (High enough in amperage) it may have been strong enough to bypass the fuse protection and burn the Alt. "Have the system checked and repaired by a good shop"!

Answer 4

Alternator, Ign coils, Ign control module, Electronic engine computer....

Answer 5

charging system damage, almost everything else is at this point protected by the key, which should be off at this point. i have made this mistake once, fried the voltage regulator.....

Answer 6

you'll pop one of the bigger fuse- so your fuse