Slide-Out Step G2 400 / 301838
Review how the Thule Slide-Out Step G2 400 301838 connects, how it operates and which installation requirements apply to this model.
Open this example as a new project. Use your own parts and cable lengths to make the plan yours.
The step motor needs a reversing control and the prescribed protected circuit. A direct two-wire battery example would omit the operating and retraction controls. Follow the G2 wiring diagram for the selected switch or relay arrangement.
The step motor needs a reversing control and the prescribed protected circuit. A direct two-wire battery example would omit the operating and retraction controls. Follow the G2 wiring diagram for the selected switch or relay arrangement.
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.
Installation notes
Guidance for this model, with sources linked beside the relevant advice.
Verified against the manufacturer's documentation (rev. SDD900-01 / 3380065400 — 2025-02-17), checked 2026-10-01. Manufacturer documentation →
This entry is the Thule Slide-Out Step G2 400, article 301838, within the 301838–301840 installation manual. The diagram represents the 12 V feed to the step and its reversing switch as an assembly. The motor's two leads do not have permanent battery-positive and battery-negative roles: reversing their polarity changes travel direction. Do not attach the catalog's simple supply pair directly to the motor as a complete control system.
The basic wiring drawing, page 9, places a 20 A fuse ahead of switch S1. The motor and the deployed-position warning switch are separate circuits. Follow the actual switch pinout and the illustrated warning connection; an unlit dashboard warning is not proof that the step is physically retracted.
The optional automatic-retraction circuit, page 10, uses relay accessory 308200, shows 2.5 mm² wiring and retains 20 A protection. It is a separate installation option with additional control connections. The catalog does not invent that harness or simulate ignition-triggered retraction.
The reviewed manual publishes the fuse value but not motor running, startup or stall current. Those values are therefore absent from the catalog. Its 20 A terminal boundary is a protected-feed planning allowance, not a claim of 20 A continuous consumption or a measured connector capacity. Final cable design needs the route, supplied harness requirements and verified motor demand; a daily energy figure cannot be established from the fuse alone.
Use the bracket, vehicle-attachment and clearance drawings before drilling. Check that the step can extend and retract without contacting the body or trapping its cable. The direction checks, pages 8–11, use brief 2–3 second operations to confirm travel and control behavior. Keep people and objects out of the mechanism during these checks. Test the warning indication and any installed automatic retraction, then physically confirm the step is retracted before driving. If it jams or repeatedly opens the fuse, isolate and inspect the mechanism and wiring; increasing the fuse rating defeats the specified protection.
Build it out
Add Slide-Out Step G2 400 / 301838 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.
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pos
positive · input
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neg
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.