Go Power GP-BMK-25 82958 Battery Shunt Wiring & Parts Guide

The Go Power GP-BMK-25 (manufacturer part 82958) is a standalone RV battery monitor with its own wired display and a 500A current-measurement shunt. This reference identifies its negative-side connections, included components and alternatives so you can select the correct type of monitoring system.

Where the BMK-25 shunt connects

The battery side of the shunt is marked B−, and the system side P−. For complete current measurement, every load and charging source must return through P− rather than attaching directly to battery negative.

Battery negative (−)No other load or charger negative wires bypass this connection
B−   |   500A shunt   |   P−B− faces battery; P− faces the RV electrical system
System negative busAll inverter, solar, converter/charger and DC load returns
Battery positive (+) → fused sense lead → shunt B+A small measurement/supply wire, not the high-current positive feed
Shunt → shielded display cable → GP-BMK-25 displayThe display sits remotely from the battery and shunt
Original component locator based on Go Power's manual. It is not a full wiring schematic or a substitute for the factory installation drawing.

GP-BMK-25 component identification

The monitor is a complete wired battery-measurement package. It combines a display, an external current shunt and a fused positive-sense connection. It does not charge the battery or replace inverter overcurrent protection.

Included component What it does
GP-BMK-25 display Backlit flush-mount screen for state of charge, voltage, current, remaining capacity and time estimates
500A/50mV shunt Installs on battery-negative circuit between battery (B−) and system returns (P−)
Fused B+ sense lead Connects battery positive to the shunt's low-current B+ terminal, using the specified protection
Shielded display cable Links the shunt and remote display; follow the included kit's actual cable length
Shunt mounting bracket Holds the current-measurement shunt securely near the battery

After installation, enter the battery bank's capacity and synchronize the state-of-charge reading according to Go Power's instructions. Supported battery types include lithium, AGM, gel and flooded lead-acid. The display can also show an additional battery's voltage where configured.

BMK-25 versus PowerTrak RV-C

PowerTrak 84025 is not a plug-in replacement screen for the GP-BMK-25. PowerTrak uses an RV-C communications network, while this kit uses its own separate shunt-to-display cable. Choose the system you actually have.

Before ordering: Check the part number on the monitor or shunt and confirm whether your RV uses a wired BMK-25 display or an RV-C network. All connected equipment must remain within its manufacturer's electrical ratings.

Exact-number monitor products

The following catalog cards include the standalone GP-BMK-25, the separate PowerTrak network system, and a Bluetooth-shunt alternative. These are different products, not interchangeable components.

Go Power original wiring illustration

The manufacturer manual includes the actual battery, shunt, solar controller and inverter wiring view under Installation — Wiring Diagram. Follow that drawing and the supplied wiring instructions for connection details and mounting.

View the factory GP-BMK-25 wiring drawing (manual PDF) · Go Power GP-BMK-25 specifications

Battery safety: Isolate shore, solar and inverter sources before service. A battery bank can deliver very high fault current; have a qualified RV electrical technician size and secure high-current conductors and protection.

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