Mk5 brm battery dying

Matthewsz

Veteran Member
Joined
Aug 9, 2015
Location
San Diego
TDI
06 Jetta, 09 wagon
Hi all, I have this Jetta that had a bad alternator pulley and battery issues. After I replaced the pulley, the battery seemed to last longer, but it still dies after a few days if it doesn't get disconnected.
The car only gets driven 2.7miles one way to work and then back. Sometimes even shorter trips.
I don't know exactly if the draining started around the same time as the old pulley noise.
Is this more likely an unrelated slow draining issue, or since the battery went flat a couple times it got ruined and the short trips can't charge it good enough?
There's plenty of voltage when running.
 

BuckeyeMan71

Veteran Member
Joined
Jan 15, 2020
Location
Ohio
TDI
03 Jetta wagon
Hi all, I have this Jetta that had a bad alternator pulley and battery issues. After I replaced the pulley, the battery seemed to last longer, but it still dies after a few days if it doesn't get disconnected.
The car only gets driven 2.7miles one way to work and then back. Sometimes even shorter trips.
I don't know exactly if the draining started around the same time as the old pulley noise.
Is this more likely an unrelated slow draining issue, or since the battery went flat a couple times it got ruined and the short trips can't charge it good enough?
There's plenty of voltage when running.

I would have the alternator tested and the battery


Sent from my iPhone using Tapatalk
 

Carlos_TJ

Veteran Member
Joined
Aug 3, 2014
Location
Tijuana Mexico
TDI
2009 Bora (BXE PD)
Are you arming the alarm when this happens? How is the status LED when arming? A failed door switch will prevent the car from "sleeping" and may drain a weak batyery overnoght
 

Matthewsz

Veteran Member
Joined
Aug 9, 2015
Location
San Diego
TDI
06 Jetta, 09 wagon
Are you arming the alarm when this happens? How is the status LED when arming? A failed door switch will prevent the car from "sleeping" and may drain a weak batyery overnoght
Yes, however only one door needs a fix and that's been like that since I bought the car, so I think something else happened. My 09 also has at least one bad door lock and it doesn't drain. I'll have to look at the led status.
 
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