I am currently having some issues with a Lancer I bought a couple weeks ago and still haven't been able to diagnose the problem. When I first bought the car I didn't have any battery problems and the car turned over, and now I have something in the car draining the battery and I cant figure it out. The car is fairly stock but there is an aftermarket subwoofer and amp along with speakers in it. The battery problems seemed to start after I fixed a grounding wire that wasn't connected to the amp but even after disconnecting all the wires to the amp it is still being drained so I don't know if it was just coincidence or part of the problem. I noticed the problem about a week and a half ago when the car completely died, so I went and got a new battery for it, that fixed the problem for a little while but then something started to drain it again. I have tried completely disconnecting the amp from all power, taken out the main amp fuse in the fuse box but nothing has helped. I have been able to jump the car a few times but currently it wont even turn on off of a jump. When I have a battery pack plugged in the auxiliary's will come on but the car will try to turn over and then just stop and give me a clicking sound if I crank the key. I am sort of at lost here as I assumed it was the amp drawing power while sitting idle and now I just cant figure it out so I need some help.

Update: I got a Voltmeter and tested my draws I charged the battery back up to 12.4v and started the car, figured out its not a Alternator issue its a parasitic draw of some kind but I don't know where to start. I tested volts after as well and got a reading of 5.0 with the car turned off so I don't know what could draw that much power in so little time.


The car itself is a 2009 Lancer GTS the only aftermarket parts on the car are:

- Subwoofer and Amp with speakers

- Intake and Exhaust

- Backup camera that goes through a rear view mirror

 

Hi there.

I own a 2009 1.5 Mitsu Lancer and had the same issue.

Things to check are:
- The Hands Free Module, easy to check if you have problems with Bluetooth connection;
- An O2 sensor or lambda sensor with it's internal resistance short circuited, easy to verify with and DTC scanner, that will report a error code;
- And the most /(& %$%&$%& issue you may find on the Lancer, the water pump of the windshield that is located at the water reservoir, no code nothing until it finally dies and you figured out it can short circuit and not even an DTC or fuse; Have no idea if Mitsu is good at doing things or simply damn luck. The water pump of the windshield has his connectors turned up, even with rubber on the connector when i disassembled mine it was all rusted. Literally died with rust and moisture.

Try to check DTC first and then any of this symptoms, as it's most likely to be one of them.

Just to notice that i did actually have all these 3 problems. Once fixed, you should be ready to go.