- Feb 5, 2024
- 269
- 489
- Funster No
- 101,061
- MH
- Etrusco CV540 DB
I wonder if anyone can help me to understand the D+ arrangement on my Schaudt B2B. The D+ input is sourced from the EBL 31 generated by a relay fed from the B pillar connector with the engine on and ignition on signals. However the current B2B is not fed directly from the D+ busbar which distributes the D+ output from the EBL 31. Instead this is switched via a relay with relay coil being powered from one of the 12V outputs on the EBL - see diagram below. This seems to imply that the B2B will only be enabled if the 12V system master switch is on, and I don't understand why that should be. The vehicle is an Etrusco Ducato based PVC, with Etrusco being an Italian branch of the German Hymer group.
The reason I want to understand this is because I am doing a major upgrade to the 12V system and am fitting a lithium battery ( see pic below) and other bits including a Renogy combined B2B and MPPT solar controller. The output from the new B2B will go directly to the new battery and not via the EBL so I don't see any reason why its D+ input cannot be supplied directly from the D+ source and not be switched by a relay.
The reason I want to understand this is because I am doing a major upgrade to the 12V system and am fitting a lithium battery ( see pic below) and other bits including a Renogy combined B2B and MPPT solar controller. The output from the new B2B will go directly to the new battery and not via the EBL so I don't see any reason why its D+ input cannot be supplied directly from the D+ source and not be switched by a relay.
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