Battle Born Li Battery Positive Terminal Wiring Explanation: 2024 Tab 400 BD

jmpschneid · October 2025

Does anyone know the function of the various wires and connections on the positive terminal of the battery?

1. The large red wire is the +DC power.

2. The small, squiggly red wire on the left likely provides a reference voltage for the Smart Shunt.

3. The small red wire connected to the +terminal (yellow crimp) in combination with the other red wire connected to the Heater Enable screw (blue crimp) and the black switch located in the bedside cubby, enable the battery internal heater to operate as needed.

4. FINALLY, MY QUESTION: What is the function of the larger gauge green and red wires and connectors????

CatDaddy · October 2025

I cant say for sure without a photo but on my 2022 320BD, the solar charger runs directly to the battery, bypassing the battery disconnect. If you have a port for a portable solar panel, the charger for it may run directly to the battery as well.

donmontalvo · October 2025

Was an image or diagram supposed to be attached?

jmpschneid · October 2025

CatDaddy: This would be consistent with a dwg I received from nuCamp some time ago. I was thrown by the fact that the larger (not largest) red wire appears to take a convoluted route from the mppt to the +battery terminal. I will confirm the next time I visit my camper, which is 4 hours away. BTW, the two green wires are pigtails to insert an inline fuse (likely 30A) into the solar feed to the battery.

jmpschneid · October 2025

Image: https://us.v-cdn.net/5021717/uploads/editor/ol/3xk0e76n532z.jpg

Yoshi_TAB · October 2025

Hi,

I can't say for sure, but it looks very similar (and a like) to the way our 360CS was wired. I moved my battery and created the below wiring diagram, but it seems to match.

My battery had 4 connections on the positive terminal as you show in your 400.

1. The larger (4 AWG?) red wire goes to Gloso breaker and then onto the ON/OFF switch and then to the WFCO

2. The very small red wire with in line fuse goes to the victron shunt to power it.

3. The smaller red (10 AWG ) wire with no fuse most likely to the aux solar input (guessing you have one in the 400). The inline fuse for my aux solar is just down stream of the input plug near the Nautalis.

4. The green wire with the fuse goes to the on board victron solar panel solar controller. In our 360, they used a green jumper wire (as you have, wired in with WAGO connectors) with a built in line fuse to connect to the solar controller. They should use red, as it does make tracing lines a bit more confusing.

Can't say for sure..but everything seems to match.

Image: https://us.v-cdn.net/5021717/uploads/editor/io/ldmda60e3il0.jpg

elbolillo · October 2025

jmpschneid said:

Does anyone know the function of the various wires and connections on the positive terminal of the battery?

1. The large red wire is the +DC power.

2. The small, squiggly red wire on the left likely provides a reference voltage for the Smart Shunt.

3. The small red wire connected to the +terminal (yellow crimp) in combination with the other red wire connected to the Heater Enable screw (blue crimp) and the black switch located in the bedside cubby, enable the battery internal heater to operate as needed.

4. FINALLY, MY QUESTION: What is the function of the larger gauge green and red wires and connectors????

There are different options for the install of the batteries. Please post some pictures of your install as this will provide clarity.

jmpschneid · October 2025

Image: https://us.v-cdn.net/5021717/uploads/editor/0a/3wt1zr0bx3je.jpg

donmontalvo · November 2025

Since my 2024 320S BBC didn't come with a wiring schematic, and since I needed to beef up battery and solar, I ended up spending a few weeks last Winter in Quartzsite, AZ scaling things up.

https://i0.wp.com/donmontalvo.com/wp-content/uploads/2025/10/20251016-Camper-schematic-1800-scaled.webp

jmpschneid · November 2025

Nice drawing. Once I chase down a couple of more wires, I'll create a circuit diagram.

elbolillo · November 2025

donmontalvo said:

Since my 2024 320S BBC didn't come with a wiring schematic, and since I needed to beef up battery and solar, I ended up spending a few weeks last Winter in Quartzsite, AZ scaling things up.

https://i0.wp.com/donmontalvo.com/wp-content/uploads/2025/10/20251016-Camper-schematic-1800-scaled.webp

Any particular reason for both fuses and breakers on the same wiring runs?

donmontalvo · November 2025

elbolillo said:

donmontalvo said:

Since my 2024 320S BBC didn't come with a wiring schematic, and since I needed to beef up battery and solar, I ended up spending a few weeks last Winter in Quartzsite, AZ scaling things up.

https://i0.wp.com/donmontalvo.com/wp-content/uploads/2025/10/20251016-Camper-schematic-1800-scaled.webp

Any particular reason for both fuses and breakers on the same wiring runs?

Yes, there are times I need or want to disconnect the solar panels. Using a circuit breaker makes it easy to follow the order of operations. To avoid pulling fuses or trying to sheld the solar panel from light.

The circuit breakers are not there for protection. They're for convenience. The fuses are for protection.

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Battle Born Li Battery Positive Terminal Wiring Explanation: 2024 Tab 400 BD

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