New battery drains out it if vehicle sits for a day

2005 HYUNDAI TUCSON
200,000 MILES • 2.7L • 6 CYL • 2WD
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RAQUEL L. BOZEK
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Everything has been replace even got a new battery, but after the car sits for a day it is drained. My question would be if the middle back brake light was taken out could that drain the battery?
Jan 4, 2017 at 12:46 AM
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WRENCHTECH
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It appears you have a parasitic draw somewhere draining the battery when parked.

There is a procedure for finding a battery draw like that.

You will need a digital ammeter and a jumper wire with clips on the ends to do this.
First rig any door switches so you can have a door open without triggering the interior lights and unplug the hood light. Remove one battery cable and attach the meter in series between the battery cable and battery post. Take the jumper wire and also attach it the same way. Leave the jumper wire on for at least ten minutes to expire all the automatic timers. Now remove the jumper wire and read the meter. Anything over 50ma is too much draw. The way you locate this is to start removing fuses one at a time until the meter drops to normal level. This will be the circuit with something staying on. Determine what components are part of that circuit and check them individually until the problem is isolated.
Jan 4, 2017 at 5:44 AM
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RENEE L
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Nice work Wrenhtech.
Jan 4, 2017 at 12:00 PM
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JOHNNY G.JR
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A voltage drop test across fuses works even better without interrupting circuits.
Jan 5, 2017 at 12:25 AM
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WRENCHTECH
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No, it does not work better. Not nearly sensitive or accurate enough.
Jan 5, 2017 at 3:26 AM