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Old 04-18-2013, 07:48 PM   #11
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Default Re: Tapping into MB factory installed aux battery

I could see the draw to this as well.

1for tv and electronics,
1f fridge pump
1 for,x.....

Each one with a dedicated cut,off switch. You can run,much smaller wire to each one and save on the large costly runs or wire.
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Old 04-18-2013, 10:26 PM   #12
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Default Re: Tapping into MB factory installed aux battery

Quote:
Originally Posted by Mrdi View Post
Connect to OEM Aux. Battery at this copper fuse, lower nut.(see pic)
Fuse as soon as possible after the connection.
You will find this fuse under the drivers seat, port, aft.
It has a plastic cover. (not shown)
Info and pic from MB Up-fitters document.
Don't forget to dis-connect the Aux. Batt. negative terminal
when playing up-fitter in this area.
WARNING!!

THAT IS NOT A FUSE!!

If it was, it would be a few kilo-amps, at least.

You can buy a fuse to fit into that spot.

See "My Climbing Rig", near the end.
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Old 04-19-2013, 02:31 AM   #13
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Default Re: Tapping into MB factory installed aux battery

Quote:
Originally Posted by NBB View Post
WARNING!!

THAT IS NOT A FUSE!!

If it was, it would be a few kilo-amps, at least.

You can buy a fuse to fit into that spot.

See "My Climbing Rig", near the end.

I beleive you mean this thread, post 63

http://sprinter-source.com/forum/sho...limbing&page=7

Bedtime now but i'll read tomorrow, thanks for the info

Last edited by Legwound; 04-19-2013 at 02:37 AM.
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Old 04-19-2013, 04:32 AM   #14
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Default Re: Tapping into MB factory installed aux battery

Quote:
THAT IS NOT A FUSE!!
I agree... it looks like the shunt for a current meter (such as a battery monitor would use to measure the current in/out of the battery).

The way those things work is that it's a carefully calibrated piece of copper, with a known (very low) resistance. Perhaps 0.001 ohm.
As (let's say) 100 amps flows through ta chunk of copper, there will be a voltage drop across it of 0.1 volts.
A sensitive voltmeter could then tell you (by seeing that tenth of a volt) that you were, indeed, drawing 100 amps.
Or, if the alternator was running (without any loads), it could also tell you how much current was crammed back into the battery.
(assuming the alternator/isolator also had to feed through that chunk of copper to reach the battery).

--dick
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Old 04-19-2013, 02:18 PM   #15
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Default Re: Tapping into MB factory installed aux battery

I use a Trimetric 2025 RV battery monitor on my battery system, not low cost, but I have been very happy with it. It will monitor two batteries. http://www.bogartengineering.com/products
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Old 04-19-2013, 03:48 PM   #16
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Default Re: Tapping into MB factory installed aux battery

Quote:
Originally Posted by autostaretx View Post
I agree... it looks like the shunt for a current meter
No, it's not a shunt, either. It's a cheap piece of copper meant to be removed and replaced by an actual fuse. There are not any systems out there that place the shunt on the positive battery lead, anyway.
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Old 01-09-2014, 09:13 PM   #17
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Default Re: Tapping into MB factory installed aux battery

This is a very helpful thread. Many thanks. Where do you hook up the negative or ground lead from an inverter if you tap in the positive under the seat?
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Old 01-09-2014, 11:41 PM   #18
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Default Re: Tapping into MB factory installed aux battery

The PSM is for loads that use the starter battery (and/or the normal vehicle electrics).
There may well be signals you want to access (such as "engine running"), but the actual *load* for the auxiliary battery would not attach to the PSM.

In the T1N, there were *no* MB "load-side" connections on the Aux Batt... you were expected to add your own.
The attached extract from a 2007 NCV3 wiring diagram suggests that there's an "External Fuse 2" with an "uncommitted" red wire attached (lower right corner).
Look for the connection *to* "External Fuse 2" on the isolator relay.

2007aux.jpg


--dick
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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))

Last edited by autostaretx; 01-09-2014 at 11:46 PM.
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Old 01-10-2014, 12:30 AM   #19
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Default Re: Tapping into MB factory installed aux battery

Factory up-fitter manual
Attached Files
File Type: pdf aux connect.pdf (2.78 MB, 393 views)
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Old 01-10-2014, 01:27 AM   #20
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Default Re: Tapping into MB factory installed aux battery

Quote:
Originally Posted by Vanwoman View Post
This is a very helpful thread. Many thanks. Where do you hook up the negative or ground lead from an inverter if you tap in the positive under the seat?
There are a couple of grounds under the seat as well.
Look towards the front under the seat and you will see them bolted to the floor
See #7 on page 3 on the previous posting pdf.
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