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Thread: Car stalling after new battery installed

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    Jr Member Hotsky's Avatar
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    Default Car stalling after new battery installed

    Last weekend my battery died got a new one installed and while driving to work next day car stalls twice! First thought was looks like my alternator is going. I was about to shell out the cash on the new one, but heard Parts Source stores do a free battery/alternator test. Got it done expecting the guy to tell me its the alternator, but nope everything works well! Ok now what? So I did some research and looks like rough idle and stalling is a thing after battery is disconnected, at least on early Mazda 3's. Apparently ECU is relearning how to function all over again, but I dont remember this happening 4 years ago when i replaced the battery! After driving for a week just to work and back 10-11km trip I would get 1-3 stalls when i'm at complete stop at a light or sitting in traffic. But today it dies while I was making a turn, luckily I was able to cost it across the street and there was no incoming traffic. So I decided to disconnect the battery wait a min and hook it up again and let it idle for a bit than went to for a drive and it stalled again WHILE costing to a red light, this doesn't even feel safe anymore and idk what to do. Whats going on with it? My car is a 2005 Mazda 3 automatic. no CEL
    Last edited by Hotsky; 01-13-2018 at 11:03 PM.

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    Default Re: Car stalling after new battery installed

    Loose connection somewhere...check not just the connections at the battery but the wires to ground (should be on top of the strut tower), wires to the alternator, wires to the ECU/fuse box, and anything else that would have been disturbed when pulling the battery.
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    Armchair Detailer Jackal's Avatar
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    Default Re: Car stalling after new battery installed

    Also check throttle body. Best to bring it to trusted mechanic. Donít drive it like that.


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    Sr Member Noisy Crow's Avatar
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    Default Re: Car stalling after new battery installed

    Also check the connections between the alternator and the rest of the car. Especially ground straps. The car should be able to run fine on just the alternator only. Also have the power steering pump checked. They are electric on these cars, and a failing pump could be drawing excess current. A good mechanic will also check fuel pressure, etc. to rule out any issues with other systems. While it is very likely the issue is electrical it could just be a coincidence that the problem started when you changed the battery. May be the battery was okay but the actual problem was draining the battery.
    Last edited by Noisy Crow; 01-14-2018 at 02:33 PM.
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    Default Re: Car stalling after new battery installed

    Happened to my 2007, after I changed the battery... it took about 1-2 weeks for the car to be back to normal. On my 2015 I had no issues like that, my battery died a few weeks ago and it worked fine after I charged it.
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