Battery slowly loses charge. Alternator at 13.4 volts.

This is the correct answer. The Draw should be less the .040ma.

This will go unheard and unchecked.

It should go noted the vehicle needs to be "asleep" when doing this. All lights and loads off. Key off.

Yes, I agree with part of your answer but you have the decimal point off or the wrong measurement value. Don’t think standard meter will read that low. 40ma or .040A
 
Another good answer. I have a tool from blue point called the "Amp hound" it can be used across the fuses with them in place when draw testing and will tell you the Draw of each circuit.

It was my best buddy when I was a Mercedes tech. Those cars are the Draw kings. They love to kill batteries with their 70+ modules......

And you were probably waiting for all of them to go to sleep.
 
https://www.convertunits.com/from/milliamp/to/decimal

Only linking that so somebody else can try it. Not being argumentative or trying to derail/clutter OP's thread.

I tried it and .04ma produced the same .00004 (.000040) amps as I did above, it's working correctly.

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I removed my posts. The way I wrote it was incorrect. My bad.

I knew what you meant. 🙂

So I went to another AutoZone, where another handheld tester said good. Would you believe the guy didn’t want to hold that switch down for fifteen seconds?? I pretty much had to MAKE him do it. Then he all but said “I told you so” when it tested good again. Sigh …

Then I was off to Batteries Plus, where another handheld meter said good. I let him check the alternator just for fun, and the tester said the alt was good but showed “voltage regulator failure”.

My searches here tell me that diagnosis may or may not be accurate. I could have a bad ground somewhere?

Anyway, that’s where I’m at right now. Gonna pick up a meter that reads milliamps while I’m here in town.
 
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When I say slowly, I mean the battery loses about a tenth of a volt per day, maybe a little more. After a week it is down to 12.5.

Looks like you have a good battery and charging system. I fail to see the issue.
 
I knew what you meant. 🙂

So I went to another AutoZone, where another handheld tester said good. Would you believe the guy didn’t want to hold that switch down for fifteen seconds?? I pretty much had to MAKE him do it. Then he all but said “I told you so” when it tested good again. Sigh …

Then I was off to Batteries Plus, where another handheld meter said good. I let him check the alternator just for fun, and the tester said the alt was good but showed “voltage regulator failure”.

My searches here tell me that diagnosis may or may not be accurate. I could have a bad ground somewhere?

Anyway, that’s where I’m at right now. Gonna pick up a meter that reads milliamps while I’m here in town.

Cool. I removed my posts and stated I was wrong to keep your thread less cluttered and on track.

Sounds like you'll find your amperage draw soon.

Keep the TJ'S on the road.
 
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I knew what you meant. 🙂

So I went to another AutoZone, where another handheld tester said good. Would you believe the guy didn’t want to hold that switch down for fifteen seconds?? I pretty much had to MAKE him do it. Then he all but said “I told you so” when it tested good again. Sigh …

Then I was off to Batteries Plus, where another handheld meter said good. I let him check the alternator just for fun, and the tester said the alt was good but showed “voltage regulator failure”.

My searches here tell me that diagnosis may or may not be accurate. I could have a bad ground somewhere?

Anyway, that’s where I’m at right now. Gonna pick up a meter that reads milliamps while I’m here in town.

The regulator is in the PCM and 13.5V or so is where my 06 runs.
 
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