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Old 06-09-2019, 12:20 AM   #61
BobLLL
 
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Default Re: Agile battery separator

Those starting battery voltages are discouraging to say the least. Either there is a high parasitic drain, or the battery is very weak. Since the battery did not seem to take a full charge from the 10 amp charger, it seems likely the battery is failing. But it is hard to tell for sure from this distance.

There is still the question of why the battery failed so soon in its life. Perhaps it was defective from the beginning. Or there was an episode like Dick described earlier, where some systems remained powered up even after he removed the key. This could have completely discharged and permanently damaged the battery. But I'm just guessing here.
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Old 06-09-2019, 12:27 AM   #62
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Default Re: Agile battery separator

OK, now we're getting somewhere... 12.07 is most assuredly low, as far as my info goes. Fully charged should show 12.6 or better.

It surprised me when I first saw it, but one of the voltage charts I have lists 12.06 as equivalent to only 50% of full charge. (!)

Check it further, but it sounds like your starting battery either has a hell of a drain on it or it can't cut the mustard any more.

EDIT: OOPS -- Bob beat me to it.... Have that battery load-tested.
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Old 06-09-2019, 01:24 AM   #63
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Default Re: Agile battery separator

Since you have the negative disconnect available ... it's "easy" for you to place a 10-amp ammeter "in circuit" by simply using a typical volt/ohmmeter's "10 Amp" connection option ... usually a 3rd socket that you never use.

Voltmeter.jpg

Use clip-leads to allow the meter to hang in there *between* the disconnect cable and the disconnect socket.
Do NOT try to start the Sprinter (it'll blow the meter's internal fuse).
The Sprinter will draw significant (but less than 10 amps) current for a few minutes after reconnection, but after that you'll be able to see how much current your "sleeping" Sprinter is asking for.

That would give us a LOT more info.

--dick
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Old 06-09-2019, 06:18 AM   #64
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Default Re: Agile battery separator

I will try and get the meter installed to read the amp draw. I'm beginning to think the old battery I had replaced just due to age was a mistake. The new one may have been bad from the start because that's when the trouble began. I want to thank everyone for all your help, it means a lot.

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Old 06-09-2019, 06:47 AM   #65
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Default Re: Agile battery separator

Should I charge the battery or for measuring amps it won't matter?
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Old 06-09-2019, 09:16 AM   #66
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Default Re: Agile battery separator

It would still read, but probably best to start with a charged battery. Seems like Ohm's law is in there somewhere.... (low voltage = high(er) amps)
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Old 06-09-2019, 03:26 PM   #67
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Default Re: Agile battery separator

I must admit that i'd be impatient and start by using the meter. If results are equivocal, then i'd charge the battery and re-test.

If the "sleeping" draw is much over 100 milliamps (0.1 amp), then something's wrong.

I agree that the battery is a prime suspect if the draw is under 100 ma.

--dick
p.s. let's see: 90 amp-hour battery losing 50% overnight. Let's call that 20 hours.
90Ah/20h= 4.5 amps theoretical.
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Get YOUR Sprinter's full configuration datacard by entering your VIN to https://www.datamb.com/
http://diysprinter.co.uk/reference <-- lots of service documentation, Thanks to Jens Moller and Arnie_Oli
((as always: this post may go through a couple of post-posting edits... so maybe give it ten minutes before commenting))

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Old 06-09-2019, 06:17 PM   #68
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Default Re: Agile battery separator

After another night of sitting, the starting battery is 12.04v and the coach is 12.61, I had expected the starting battery to be in the 11's! It's on the charger now. I need to find away to connect my meter leads to the van cable's as my meter leads are needle like probe ends.
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Old 06-09-2019, 08:34 PM   #69
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Default Re: Agile battery separator

I saw a note in my owner's manual that says the windows have to be reset if the connection by the pedal is removed...Is it any different than removing the battery?
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Old 06-09-2019, 09:55 PM   #70
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Default Re: Agile battery separator

No different.
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