Blue Sea 7622 is a 12V magnetic-latching automatic charging relay for managing two battery banks. The relay can combine banks when charging is detected, isolate them when charging stops, and provide a manual override. Its included remote-control switch is Blue Sea 2146. Use the manufacturer's exact wiring and troubleshooting documents rather than choosing connections from a generic dual-battery diagram.
See the matching Blue Sea parts
Each photograph links to its own NewRVParts listing. A pictured electrical component is not included with a different product unless specifically listed in that product package.
7622 — 12V ML-ACR Automatic Charging Relay With Manual Control12V, 500A continuous when installed with wiring sized to maker ratings
5511e — e-Series Dual Circuit Plus Battery SwitchOFF/ON/COMBINE; 350A continuous rating per circuit
6006 — m-Series Single-Circuit ON/OFF Battery Switch2 positions; one battery input; 300A continuous
5026 — ST Blade 12-Circuit Fuse Block With Negative Bus and Cover12 fuses, common negative-return bus, protective cover
Identify the correct model
| Component or connection | Manufacturer identification | What it does |
|---|---|---|
| ML-ACR relay body | 7622 | 12V battery-bank automatic charging and isolation device |
| Remote-control Contura switch | 2146, included with 7622 | ON/OFF/AUTO control, with status LEDs |
| Primary high-current terminals | A and B; 3/8-16 studs | Connection points for the two battery-bank positive circuits in the original schematic |
| Ground reference | Black control lead | Electrical ground required for operation and voltage sensing |
| Remote command | Red control lead | Remote switch function described in Blue Sea instructions |
| Status indicator | Yellow LED lead | Reports combined/isolated condition to the remote switch |
| Start/engine isolation inputs | Brown, green and orange control leads | Optional function depends on the installation configuration |
| Manual override and lockout | Latching knob on 7622 housing | Local combine/isolate control and LOCK OFF for servicing |
| Example separate manual switch | 5511e Dual Circuit Plus | Independent manual battery-switch product for appropriate system designs |
| Example branch distribution | 5026 ST Blade fuse block | Separate load-circuit fuse distribution; not supplied with the ACR |
How the 7622 responds to charging and battery voltage
The manufacturer ratings and functions below apply to the specified models. Compare the exact product instructions and installed circuit before purchasing.
| Condition | Manufacturer behaviour | Important note |
|---|---|---|
| Charging above 13.5V for 30 seconds | Automatically combines the two battery banks | Also combines at 13.0V sustained for 90 seconds |
| Battery voltage below 12.35V for 10 seconds | Isolates the battery banks | Also opens below 12.75V sustained for 30 seconds |
| Voltage above 16.2V | Overvoltage lockout opens the relay | Status LEDs can indicate lockout |
| Start isolation enabled | Temporarily separates battery banks during cranking | Optional configuration; not active without the required system connections |
| Manual combine enabled | Allows temporary manual parallel connection | Follow the product's remote-switch and local-latch instructions |
| Relay current rating | 500A continuous with manufacturer-specified cable capacity | The published 500A rating depends on conductor size and installation details |
Original Blue Sea manufacturer diagram
The original wiring and terminal illustration identifies this equipment without substituting a generic RV electrical drawing. Use the current manufacturer instructions when planning an installation.
The manufacturer document opens separately on phones, making terminal labels and warnings easier to inspect.