Hey guys, so I’ve had to jump my 2018 Jeep Compass three times in the past five days or so because I’ll get up in the morning and it won’t start. I’ve had three separate AutoZones or Advance AutoParts tell me that the battery, starter, and alternator are in good health and that I don’t need a new one, but then this keeps happening again. Is there anything else that it could be besides a battery problem? When I try to start it up the engine makes some sounds and tries to start up but doesn’t, and the inner console and ac all turn on fine.

The brake also gets locked up a bit, but I assume that’s just because the car can’t turn on, and even though it’s a bit locked up when I try to turn the car on it still tries to start up so I don’t think that’s a separate problem.

Any advice would be great thanks!!

  • NVPcMan@alien.topBEnglish
    1·
    1 year ago

    You might have a parasitic load somewhere in the vehicle.

    Check all the fuses with a multimeter when the vehicle is off. If you find one with current across it, that’s your likely culprit.

  • zachok19@alien.topBEnglish
    1·
    1 year ago

    Parasitic loads of even an alternator that’s going out can drain a battery intermittently.

    That said, I’ve fought with the cat stores a couple of times now over batteries that were 'nearly 100%" that were doing this crap. Every time replacing the battery was the fix.

  • Griffie@alien.topBEnglish
    1·
    1 year ago

    How old is your battery? I was told several times my battery was fine too, until it died without warning. Gave it a full charge, and later that day it died again. I replaced it and that cured the problem. I’ll agree with what others are saying too about a parasitic load draining it.

  • Audiofyl1@alien.topBEnglish
    1·
    1 year ago

    You have to find out the issue when it won’t start.

    There could be a faulty/failing connection somewhere in the primary electrical (Battery/fuse box/ ground ) - meaning it will pass power ( your dash lights up) but when high current is needed to start the engine, it can’t manage.

    It needs to be investigated when it’s broken, but when it’s working.

  • tomhalejr@alien.topBEnglish
    1·
    1 year ago

    Don’t go to a parts store for diagnosis.

    If it’s still the original battery it’s time to replace it regardless. Any corrosion/bad connections will also need to be sorted.

    Do you have a battery / electrical shop in your area?

  • traineex@alien.topBEnglish
    1·
    1 year ago

    6 yr old battery. Replace it, urs calls for agm ($300ish so go to costco)

    If thats a no fix, have a tech figure it out, not autozone