Slides / jacks

Know the system first

In-wall (Schwintek-style) with synchronized motors: see SLIDES: SCHWINTEK. Cable or rack-and-pinion with a gear motor. Electric-over-hydraulic with a pump and cylinders. Levelers: electric jacks (see LEVELING: GROUND CONTROL) or hydraulic jacks with a pump.

First checks for any slide or jack

Battery at 12.5 V or more (use a charger during tests)

Fuses and breakers good, grounds tight

Controller or switch has power and ground

Interlocks satisfied (parking brake, ignition, level sensors)

Nothing blocking the slide: debris, seals, doors, furniture

Voltage at the motor, under load

Run the slide and measure at the motor leads. If it is more than about 1 V below the battery, there is too much resistance in the wire, a connection, or a relay. That is the most common cause of weak or slow slides.

Amp draw

A DC clamp meter shows current while the slide moves. Compare slide to slide on the same coach. A sudden rise means binding. Slide motors often pull tens of amps; get the spec from the maker.

Manual override

Every system has one: a crank or drill point, or a hydraulic bypass. Check the owner or service manual for the exact method before you force anything.

Synchronization

Synchronized slides need to be re-learned or re-synced after a power loss or repair. Follow the manufacturer sync procedure.

Monitoring slide motor current

A shunt-based current monitor reads motor amps, shows live current, trips on a stall, and sounds a buzzer. The display only shows what the motors draw. It never drives a motor.

Slides and jacks can pinch or crush. Keep people and hands clear. Never work under a coach that is only on jacks. Use jack stands or cribbing.