John McGrath Auto Group

I recently had a disappointing experience at this place. After my 2016 Isuzu MUX's battery went flat overnight, I was told that the issue was due to leaving the car unlocked, claiming it increased the parasitic draw enough to drain the battery. However, after testing it myself with a multimeter, the draw was only 15mA, which is a minimal consumption and not nearly enough to flatten a healthy battery overnight. This information is also more applicable to newer vehicles, and even then, it would take a few days, not hours, to drain a good battery.



Beyond the inaccurate information, I found their customer service lacking—there was little willingness to discuss or investigate other possible causes. This battery is still under warranty, and I expected a more thorough and honest diagnosis. I don't recommend them.