Can A Bad Radio Drain Your Battery. However radios usually dont use a lot of power so battery drainage is more likely to be caused by other things such as lights fans and heaters. I had a problem with my 99 Miata needing frequent jump starts even though the battery is only about 18 months old.
Again disconnecting a circuit like a radio and then having the battery stay up would point to the radio circuit being at fault. Several write up talked about relay inside the radio can go bad and stick closed. Interior lights and radio when turning on can drain the battery.
Once you have ruled out other causes you can then proceed to check if.
This way you will be able to supply enough energy for your car audio system and at the same time your battery will always be charged. If a radio is newly installed it is most likely wired to a fuse that receives power when the engine is off. So the battery on my car would drain after only around a day or two if the car hadnt been driven. Rest of the detail can be read here.
