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The radio fuse is in the fuse panel inside under the left side of the dash. It is marked on the fuse cover as Radio, clock. If the battery drains down fast, like overnight there is another problem, sometimes aftermarket alarm systems will drain the battery down. Check for any lights that may be staying on like the stop lights or interior lights.
A possibility is an ignition fuse has blown when the radio was removed. Does the battery light light up when the ignition is turned on. The alternator needs that light to energise and charge, (without it you just run the battery flat), failing that charge the battery, connect an amp meter in series, with every thing switched off, should have a reading of about 0.5 amps (Time clock). If above 2amp that is what is draining the battery. Watch meter and pull fuses one at a time, when the reading drops, that is the circuit/equipment that's causing the trouble.
sounds like the radio it's the problem. to make sure it is, you have to do what mechanics call a parasite circuit test, simply buy a test light at your local auto parts store, open the engine hood and look for the battery disconnect the negative cable and connect the test light in series with the battery and negative cable, the test light will stay on indicating that in fact there is a parasite circuit drain, find the fuse box your car comes with a owner's manual this manual it's helpful to find the fuses in the car, now that you find the fuses take out one fuse at the time until the test light goes off, (important put the fuse back before moving to the next one) when the test light goes off by removing the fuse, that is the circuit that it's draining the battery, check the fuse number whit your owner's manual to see if the radio in fact it's part of the fuse circuit. if not then you have a drain somewhere else in that circuit, (important the car doors must be close while doing this test or the interior light will stay on causing a normal drain keeping the test light on. and if the test light does not come on when connecting it in series don't panic this means the drain it's too small and then you have to do the same test but this time using an amp meter which it's more expensive and more complicate than the test light.
If the battery is ok (you did a load test?) and all is well without the fuse being in, then there is still an unusual draw, which is measured in amps, not volts - use an ammeter inline with the fuse. One of the most common causes of this problem is a light that won't shut off the way it is supposed to, such as the underhood service light or the trunk light. Any short would blow the fuse.
make sure your DOME light dimmer switch is not on.If light still on the radio, then remove the 10 amp fuse for the radio.If light goes out you can either replace the radio or re-install the fuse each time to listen to your radio. there is a short somewhere causing the radio light to stay on.
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