From the maker
What the catalog says
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.
Engine
Engine 23HP — Volvo Penta MD11C wiring diagram
See the Engine 23HP — Volvo Penta MD11C 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.
Cable sizing for this example
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.
10 ft one way
12 V system
- Wire
- 2 AWG · 35 mm²
- Example fuse
- 250 A
- Cranking current
- 110 A
- Voltage drop
- 2.8%
Sized against ABYC E-11. The cranking current is what the starter draws. ABYC E-11 doesn't require a fuse on a cranking-motor conductor, so the fuse shown is the usual cranking-rated (Class T) choice, sized to hold the crank without nuisance tripping — it isn't there to protect the wire. The length is one way; voltage drop includes an equal-length return.
Run-length and manufacturer assumptions
The editable example uses 3.048 m (10 ft) runs unless a shorter run is stated. Metric overviews round these to 3 m. Adapt the parts and lengths to your installation before choosing cable and protection.
Wiring diagram
How the MD11C 23HP is wired.
Open this example in Crimp to use your own parts and cable lengths. Review the assumptions and installation notes as you adapt the circuit.
Build it out
Connect it to the rest of your system.
Add MD11C 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
Specifications, terminals and supporting parts.
Check the model, ratings and connection points against your own unit before choosing installation hardware.
Catalog specification
- Continuous draw
- 110 A
- Rated output
- 35 A
- Surge current
- 220 A
Supporting parts
- 20 ft total of 2 AWG (35 mm²) marine cable
- Terminations for 2 AWG cable, matched to the equipment's screw terminals, leads or studs
- 250 A cranking-rated (Class T) fuse at the battery
- Heat-shrink, strain relief and terminal boots sized to the cable
Check stud sizes, fuse type, run length and how warm the space gets against the gear you actually have before you order.
Terminal map
Catalog connection points, current direction and planning limits. Check the manufacturer's pinout and connector ratings before installation.
Starter
starter
positive · input
Alt B+
alt-pos
positive · output
Block GND
gnd
ground · bidi
Method & provenance
Where the specifications and sizing come from.
Manufacturer specifications describe the equipment. Crimp calculates cable results from the circuit and assumptions you enter.
ABYC E-11
What Crimp worked out
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
Plan your installation with MD11C 23HP.
Open this example as a new project. Add your equipment and cable lengths, then review the sizing and checks for your setup.