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Thread: Parasitic drain-room fuse

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    Default Parasitic drain-room fuse

    Hey there, looked on all forums I could find, and no answers that help me. So my $600 2005 mazda 3 sedan has a few issues, but the one I can't fix is the parasitic drain. My battery is a bit weird, putting out between 35-80 amps (if I'm reading my multi meter right, on 10amp setting it says THIS MUCH-THIS MUCH). The amps drop THIS MANY down to THIS MANY when I pull my "room" fuse. I know it controls door locks with the fob, radio, dome lights, map lights, etc. My door lock actuator on drivers side doesn't work with fob so I have to insert and turn my key to lock/unlock from the outside. It also doesn't respond to lock buttons from the door. After removing the actuator and locking myself out of my car (long story) I still have a amp drop from the room fuse. Take out my radio, still have a drop, so I'm not sure where to go from there. Thanks for any help or ideas!

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    Default Re: Parasitic drain-room fuse

    So my dumbass also forgot to put the amp info where the words "THIS MUCH" WAS. anyway, here's the normal amp between 60-70 amps, with a drop of 50 amps down to between 18-24 ish.

    Multimeter on 10 amp setting is 0.60-0.70 ish down to 0.18

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    Jr Member G ~ MINI's Avatar
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    Default Re: Parasitic drain-room fuse

    Ive had the same battery drain happening on our 2005 Mazda 3 .
    Sometimes it would drain overnite and it would go days.
    Always started with a boost ... in the end we changed the battery
    its all fine now. We also make it a point to drive the car everyfew days
    and to not leave anything on , radio, AC ... they all get turned off ...
    6 month since we changed battery .. no issues

  4. The Following User Says Thank You to G ~ MINI For This Useful Post:

    theblack23 (04-27-2021)

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    Default Re: Parasitic drain-room fuse

    Thanks for the response, I'm not 100 confident in my battery, but canadian tire tested it after charging it and they said it still had good capacity left. Instead of taking the opportunity to sell me a new battery they didn't, so I believe them. Replacing my battery might help but I want to be sure that it won't drain again.

    Sent from my SM-A715W using Tapatalk

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    Default Re: Parasitic drain-room fuse

    Quote Originally Posted by theblack23 View Post
    Thanks for the response, I'm not 100 confident in my battery, but canadian tire tested it after charging it and they said it still had good capacity left. Instead of taking the opportunity to sell me a new battery they didn't, so I believe them. Replacing my battery might help but I want to be sure that it won't drain again.

    Sent from my SM-A715W using Tapatalk

    How old is your battery ?

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    Default Re: Parasitic drain-room fuse

    Quote Originally Posted by G ~ MINI View Post
    How old is your battery ?
    About 3 years. Not used often though. Was sitting for a while as the mazda is an ongoing project.

    Sent from my SM-A715W using Tapatalk

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