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Topic
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2009 Acura MDX 105,000 miles one owner. Interstate Battery is 23 months old, battery checks out good as does alternator.
Nothing that I can detect is left on. Mechanic replaced AC clutch relay switch per Acura bulletin. Not the answer.
Before the battery started draining out the radio went to auto theft mode while car was parked in my garage. Radio did not have power even to reset code.
I checked the fuse, fuse was good, replaced it and radio worked after I reset code. This happened off and on for a couple of weeks. Each time I took the fuse out and replaced it. Radio has worked well without removing fuse for about three weeks. First time battery went dead I had not driven the car in 48 hours. Now it is taking less than 24 hours to go dead. Does anyone think that this radio fuse could have anything to do with battery drainage. All three mechanics I spoke to say no. Does anyone know what it could be? Or perhaps has had the same experience and solved it?
Thank you
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If its one thing I have learned is that on cars sometimes anything is possible. I would do as stated by CJ1 pull the fuse and see if it still goes dead.
Clean the battery with warm.water and baking soda mix. Use an old toothbrush. A slimy film on a battery can drain it.
You can check which circuit is draining. Here’s how.
Key out, doors closed. Disconnect the negative cable from the battery.
Set the voltmeter for 20 volts DC. Connect one side to the cable, other to the negative battery post. It should read very low or no voltage.
If there is significant voltage showing, remove one fuse from the fuse box. No voltage drop? Put that fuse back in and go to the next fuse. Do this test on all fuse boxes if needed.
When you pull the fuse that makes the voltage go very low or to zero, then you know which circuit needs to be investigated. It could be a single.component or a switch. Maybe there is a rusty connection on a door jam switch or a broken chassis wire, or who knows, until you track it down.
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