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Parasitic Drain kills battery in 2 days

Parasitic Drain kills battery in 2 days

Old September-10th-2018, 08:21 PM
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Parasitic Drain kills battery in 2 days

I have a 2007 mazda 3 hatchback that wont start if it sits for a few days. The battery is a few months old and autozone tested it and the alternator and both pass. If the car is driven daily it starts fine. I did a parasitic drain test and see 1.6A of draw with all doors shut/locked. I was able to trace the draw to the btn fuse and by removing it or unplugging connector J0-1 on the PJB the draw drops to near 0A. I pulled all the fuses in the PJB but the draw is still 1.6A. I removed the PJB to check for missing pins or corrosion and found that the J0-1 connector had a slight amount of greenish corrosion looking stuff in a few spots. I cleaned it as best I could but no change in draw. I checked all lights etc to ensure everything is off. Everything seems to work fine on the car.
Any ideas of how to narrow this down further?
Thanks
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Old November-23rd-2018, 08:47 AM
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This is an ongoing issue with my 2010 Mazda3 Hatchback. It started after I drove through some deep water, the car still ran, but the next day the parasitic drain issue began and it wouldn't start after sitting overnight. I spent a lot of time investigating fuses, forums etc & finally had my local repair shop look at it. I spent a ton of money with them & they could only guess what the cause might be. Replacing the battery was a huge help, but the current draw still exists, so I've installed a battery disconnect switch:
https://www.harborfreight.com/batter...tch-97853.html
I disconnect the battery if I know the car will be parked for more than a day, like at the airport.
I have been shocked to learn that WalMart batteries only carry a 2 year warranty now & will die shortly after this, even here in the deep south. This was part of my problem. I remember not too long ago a battery would be good for 4-5 years. I'd like to know if non-WalMart batteries are also short-lived.
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Old November-23rd-2018, 04:53 PM
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I ended up taking it to mazda and they identified the issue as the PJB and replaced it with a used one and the draw is gone. They said it was due to the corrosion in the PJB.
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Old November-25th-2018, 10:52 AM
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Um, what's a PJB?
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Old November-25th-2018, 11:48 AM
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passenger junction box. its the fuse box below the dashboard on the passenger side
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