Load
See the Whale Watermaster EP1612 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.
1 m one way
12 V system
Sized against ABYC E-11. The design current is the part's continuous draw. The length is one way; voltage drop includes an equal-length return.
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.
Manual specifies 5 A automotive fuse and 9.5–14.5 V. Example represents the correctly switched Whale socket feed and original pump/plug assembly, not a spliced submersible motor lead. Keep pump submerged and verify loaded voltage. Manufacturer installation manual
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.
Manual specifies 5 A automotive fuse and 9.5–14.5 V. Example represents the correctly switched Whale socket feed and original pump/plug assembly, not a spliced submersible motor lead. Keep pump submerged and verify loaded voltage. 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. Whale Watermaster exterior pump range installation and operation instructions, manufacturer PDF mirrored by Amazon), checked 2026-10-01. Manufacturer documentation →
The EP1612 Watermaster uses the Easi-Push plug for the compatible Whale inlet socket. It is not the EP1622 version for the Truma Crystal II socket. The model list, page 1, should be checked before ordering a replacement. The catalog supply terminals represent the installed socket feed rather than loose contacts to splice into the sealed pump plug.
The technical table, page 2, gives a 9.5–14.5 V supply range and 3.8 A at zero delivery head, decreasing to 3.5 A at 3 m head. Its zero-head flow figure is 15.8 L/min under the stated conditions. The model uses 3.8 A as the greatest listed operating current; startup and connector current ratings are not supplied.
Use the specified 5 A automotive fuse. Connect the socket supply to the appropriate pressure-switch or tap-microswitch arrangement shown in the manual; the submersible pump is not an always-running water source. Confirm polarity from the actual socket and loom markings rather than assigning colours to unseen wiring. Extension length and conductor sizing require the complete socket installation instructions and a loaded-voltage check.
Place the pump into the water container before energising it. Keep the pump submerged during operation and ensure the hose can reach without being kinked or pulling on the plug. Never use the power cable as a lifting handle. Keep the plug and socket clean and fitted as intended, particularly when handling the external container beside the vehicle.
Open a tap to purge air, switch on, and verify water delivery, correct control-switch operation and a secure socket connection. If the pump fails to supply water, check immersion, trapped air and the fuse before repeatedly running it. Disconnect and drain the external pump and hose for freezing storage. A pressure-control fault and a failed motor can give similar symptoms, so test the socket circuit before replacing the pump.
Build it out
Add Watermaster EP1612 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.
Catalog connection points, current direction and planning limits. Check the manufacturer's pinout and connector ratings before installation.
Socket switched +
pos
positive · input
Socket DC −
neg
negative · input
A dash means a current rating is not specified here.
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. Boats built to UK or EU rules answer to ISO 13297 — check these figures against it before you build. 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.