Blue Sea Systems
See the Blue Sea SI-ACR 7610 connection points and wiring example. Open the diagram in Crimp to add your equipment and plan the cables between them.
Open this example as a new project. Use your own parts and cable lengths to make the plan yours.
Use the diagram as a starting point for your installation. Replace the example equipment and cable lengths with your own, and check the connections against your exact model's instructions.
Cable sizes depend on the connected equipment, current and cable lengths. Add those details in Crimp to size each run.
Wiring diagram
Open this example in Crimp to use your own parts and cable lengths. Review the assumptions and installation notes as you adapt the circuit.
Starter bank +
positive connection
1 AWG (50 mm²) · 175 A fuse
3.3 ft one way · 120 A design
To SI-ACR 7610 A
House bank +
positive connection
1 AWG (50 mm²) · 175 A fuse
3.3 ft one way · 120 A design
To SI-ACR 7610 B
Starter bank −
negative connection
1 AWG (50 mm²) · unfused return
3.3 ft one way · 0 A design
To Common negative −
House bank −
negative connection
1 AWG (50 mm²) · unfused return
3.3 ft one way · 0 A design
To Common negative 1
SI-ACR 7610 GND (1A fused)
negative connection
16 AWG (1.5 mm²) · 1 A fuse
1.6 ft one way · 1 A design
To Common negative 2
Example allowances · ABYC E-11 sizing · verify actual protection
Two 12 V AGM placeholder banks share a negative bus. Each positive reaches a separate ACR stud through its own 175 A fuse and 50 mm² cable. These conservative example choices use the manual's up-to-120 A table, not a prediction of bank-to-bank current. GND has the required 1 A inline fuse. Replace placeholder bank limits and verify fuse type, location and charging source. In Simulate, select Combined or Isolated manually; automatic timing and equalization current are not predicted. Manufacturer installation manual
Edit this wiring exampleInstallation notes
Guidance for this model, with sources linked beside the relevant advice.
Verified against the manufacturer's documentation (rev. 990170140 Rev.011), checked 2026-09-16. Manufacturer documentation →
The Blue Sea 7610 SI-ACR is a 12/24 V automatic charging relay rated for 120 A continuous current. It senses both banks and connects or isolates them as charging conditions change. It does not regulate battery charging current. The ML-ACR 7622 is a separate product.
The manufacturer diagram places one battery-positive connection on A, the other on B, with protection at each battery. The two studs are interchangeable. GND needs its own 1 A fused connection to the common DC negative.
The example contains two 12 V AGM placeholder banks, the relay and a common negative bus. Each ACR power lead is 1 m, with a 50 mm² conductor and 175 A fuse. This choice meets both manual tables at up to 120 A; it is not a prediction of equalization or charging current. The separate control-ground lead carries a 1 A fuse.
Replace the banks and their assumed current limits, then add your actual charging source and loads. Review fuse location, interruption capacity and disconnects. A relay contact rating is not a current limiter.
In Simulate, select Combined or Isolated to inspect those two circuit states. Crimp does not choose the state from battery voltage, simulate the relay's delays, or predict battery-equalization transients. The hardware performs that automatic control; the diagram records an assumed state.
The optional start-isolation and remote LED connections are omitted. Follow the manufacturer diagram for them. The 7610 must not carry engine-starting current; an emergency-start arrangement needs its own suitable switching path.
Each battery side needs appropriate protection, and the banks need a common negative connection. For a system requiring controlled battery-to-battery charging, compare the Orion XS example. Whether a relay or charger fits depends on the actual batteries, alternator and charging requirements.
Build it out
Add 7610 to your diagram, then connect your batteries, chargers and loads. Crimp calculates cable sizes and checks the connections as you draw.
Every cable you draw there is sized against ABYC E-11, from the same tables as the reference on this page.
Technical reference
Check the model, ratings and connection points against your own unit before choosing installation hardware.
Check stud sizes, fuse type, run length and how warm the space gets against the gear you actually have before you order.
A and B are interchangeable battery-positive studs. GND is the small control return, not a load-return bus. Optional start-isolation (SI) and remote LED leads are omitted; follow the manufacturer diagram for them. The relay must not carry engine-starting current. A 120 A contact rating does not mean the relay limits charging current to 120 A.
A
a
positive · bidi
B
b
positive · bidi
GND (1A fused)
gnd
negative · input
Method & provenance
Manufacturer specifications describe the equipment. Crimp calculates cable results from the circuit and assumptions you enter.
From the maker
Manufacturer, model, ratings and which terminal does what come from the catalog. A newer revision, or the nameplate on the unit in your hand, can say something different — when it does, the nameplate wins.
ABYC E-11
Sized against ABYC E-11 — the US reference, and what Transport Canada accepts as an alternative to TP 1332 for pleasure craft under 24 m. The run length and the current above are what drive the result. Crimp doesn't know how warm your space gets; draw the cable inside an engine-bay zone on the canvas and it sizes for the heat.
Next step
Open this example as a new project. Add your equipment and cable lengths, then review the sizing and checks for your setup.