Positive Post Van Starter Battery

[86Scotty]

Originally Posted by SwiftRaven

I am replacing the original AGM batteries with Lithium. Should be somewhat straight forward. Right? Wrong! Sportsmobile in Indiana built the Van and when it came to documenting the wiring they did nothing. No wires are labeled, only 1 buss, all other connections are bolted together and tapped, no battery or load shutoff switches. So disappointing. As a result I am tracking down every wire. Have a look:

That's pretty standard for any RV converter in my experience. About the best you can hope to find in the way of labeling is just at the house fuse box.

Good luck! If anyone here can help you Greg can.

[SwiftRaven]

From a 2019 thread, same problem diagnosed

[Scalf77]

Yes, you can get ride of the flying Y connection. The monitor "BMK" would have worked good for everything but your Inverter/Charger.

-greg

[Fitz]

Back to the original question, suggest you look at post 185 in my build thread for some additional info. There is a SMB installed fuse in there that you will want to know how to access and carry a spare for.
https://www.sportsmobileforum.com/fo...-16293-19.html

[SwiftRaven]

Thank you! Talk about an alligator waiting in the swamp! I will get a couple spares and likewise hope that carrying the spares is good insurance.

[Fitz]

Thinking about it, I recalled that I also added some additional information that you will want, look to post 384 in the same thread. It took me a while to find it, that’s a long thread!
https://www.sportsmobileforum.com/fo...-16293-39.html

[SwiftRaven]

What is that circuit used for and why did SM bother when Mercedes provides a point to pick off power from the alternator. Terminal 30 is located on a distribution bus under the drivers seat.

[SwiftRaven]

Is this correct connection for replacing SurePower unit with Victron Orion unit (it is the ISOLATED version)
use the same input (positive) that was on SurePower unit
use Sprinter ground point under driver seat for (-) input on Victron unit

Or must I come off the (-) post of the Sprinter starter motor battery?