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Need some help with upgraded battery (want back to stock)

1122 Views 7 Replies 3 Participants Last post by  perseus

2011 Mazda 3 S Grand Touring Hatchback 2.5L

Hey everyone

So this car was wired for subs prior to me buying it and I’m currently trying to get the battery back to stock

Couple questions about what I have going on here. First, is that fat wire coming from the negative terminal the ground? It looks like it’s just going to the engine bay with some custom mount. Second. What is the taped wire that’s near the fuse box? I vaguely remember the person I bought it from saying that’s the ground but then what’s the fat one? The taped one says kicker on it so it isn’t anything factory

In the trunk, I have two wires, one blue, one black that both look the same gauge. Haven’t followed them so not really sure how to handle them yet but I’m guessing one may be another ground for the amp?Have no clue what the other could be so let me know what you think

I attached a picture of the battery but let me know if you need any additional info

Thanks for the help!!
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a battery can have multiple ground wires going to it, that's no problem. one of the wires is going to the vehicle body. the other i can't see. they chose one of the dumbest places to put their new ground cause it gets wet there as is obvious from the rust. i would relocate this ground soon.
in your trunk, the blue wire is likely the remote signal wire and the black wire was to ground their amp
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Yeah on most stock batteries I see the ground is going to above the strut mount. So I can just take off that fat one and replace it with a stock ground and stock battery terminal? And obviously ground it to a safer part of the engine bay
i'd keep the kicker battery terminal. there's nothing wrong with it. just move the ground to a better location
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