Arizona Auto Repair

View Our 7 locations

My heavy-duty battery often runs down

Q: I have a 2005 MR-2 Spyder, made in the last year Toyota made that model. I love the car, but don’t drive it very often, since it has only 15,000 miles or so on it. As a consequence, the heavy-duty battery often runs down. I’ve been told that part of the reason is not only the convertible’s infrequent use, but the fact that it was equipped originally with a Mobile Guardian system which aids in vehicle recovery and remotely disabling the vehicle. This system has never been used, but surely must help draw down the battery.

I have asked several garages to disconnect this system, but no one is willing to do that. Do you have any suggestions that will help?

Thanks for your help.

Robert L.

A: The alarm system should not be creating enough of an electrical draw to drain the battery, unless the car is being driven very infrequently (such as only once every few months). I would recommend you take the vehicle into a qualified service center that is proficient in electrical problems and ask them to conduct an Amp Draw test on the battery to determine the largest draw on the battery.