I plugged my block heater in last night. This morning, my car battery was completely flat. The door locks wouldnt even work! Anyone know why? The car is Forrester...i'm thinking maybe a short in the grounded extension cord???
Answer
I'm just guessing, but did you leave a door or the hood open? They all have lights that come on when they're opened, and they could have drained the battery overnight if it was just a little weak. There's no way that the block heater could hurt anything, it's completely isolated from the car's circuitry.
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