Just got my car back with the Y8 swap and it was running great for a couple weeks!

Then I took it to Best Buy to get an alarm and radio put in since they were running free instalation.

It still worked fine but I had left the car in valet mode. I only armed it a few times over the last couple weeks. After I changed the car from valet to armed the 1st time...I come out of the store and boom..batty's dead... I was able to jumpstart it and get home but I had to keep the motor revving or it would die out + gauges were jumping all over.

Put in a new battery and it was fine. Until the other day, I armed the car, came back 3 hours later and disarmed....it barely started... On the way home it started to die out on me at the stoplights so I had to keep it revving to get home...even on the highway, the lights would go dim and the gauges would jump like crazy...it still ran but if I took my foot off the gas it died...

I can jump the car and it will get up and run fine but my battery will not hold a charge..???? Could it be possible that the alarm or radio install could have messed something up here?

Maybe an alternator? I don't know what else could be suspect?
I need to get this fixed quick so any feedback would be appreciated! Thanks!

 

must be something small draining the battery, or the alternator might need to be respun

 

your alarm seems to be doing its job...a dead battery makes stealing the car that much harder.

i would guess there is something screwy with the alarm...id go back to Worst Buy and ask them WTF!

 

If you want to hunt it down yourself put a ammeter inline with the battery (+) cable and pull fuses one by one (pull and put back if no change) until the amp draw turns to 0, when that happens you can isolate the circuit where the draw is and find out whats going on. Make sure the car is off while doing this btw!