**Victron non isolated B2B - how to wire up**

[Alesupper]

Hi folks, apologies if this is a dumb question but I am not 100% sure on how to wire up the Victron non isolated version of their b2b. The vehicle and leisure batteries in my campervan are both connected to the vehicle chassis, hence why I am buying the non isolated version. The question is which battery do I run the negative cable from to the b2b? Perhaps it doesn't matter? Or do I have to run a cable from the negative terminal on my vehicle battery to my leisure battery and then run another negative cable from the leisure battery to the b2b? I hope that makes sense?
Your advice would be much appreciated. TIA.

 

[Gromett]

My thoughts are;
If both batteries are connected to the chassis then either will do. Although I would be tempted to look for a nearby chassis connection for the B2B as well?

 

[Steve and Denise]

Non isolated use the chassis, just check your connections for good contact ie star washers.

 

[Alesupper]

My thoughts are;
If both batteries are connected to the chassis then either will do. Although I would be tempted to look for a nearby chassis connection for the B2B as well?

Thank you. I think that I am going to use a busbar to connect all the negatives (starter/b2b/leisure).