1. Power: Ignition-Switched From the 24V Rail
Take power from an ignition-switched circuit on the 24V rail — the camera records with the engine and sleeps when parked, no battery drain on layover. The TM-series auto-senses 12/24V, so no converters or regulators. Fuse the tap (2-3A is sufficient), and keep the camera's own low-voltage protection in the loop for vehicles with long depot dwell.
- Ignition-switched 24V tap
- 2-3A fuse on the tap
- Auto-sensing — no converter needed
2. Reverse Trigger: The Wire That Flips the Screen
The reverse-trigger wire connects to the reverse lamp circuit. When reverse engages, the monitor switches full-screen to the rear camera with guidelines — automatic, every time, no driver input. On coaches with multiple reverse events per shift, this is the feature drivers refuse to give up. Lamp-circuit voltage on 24V buses is within the trigger's tolerance; confirm polarity with a meter before tapping.
- Trigger wire taps the reverse lamp circuit
- Full-screen rear view on reverse
- Verify lamp polarity with a meter
3. Cable Runs: 15 Meters Without Signal Loss
AHD camera signals run cleanly to 15 meters on the supplied cables — enough for a 12-meter coach with routing slack. Run camera cables inside the body with the vehicle's existing loom, keep them away from the alternator output and ignition harness (noise shows as stripes), and use the supplied screw-lock connectors — vibration loosens push-fit plugs on coach duty. Extension sets are available for articulated and double-deck applications.
- Clean signal to 15m on supplied cable
- Route with existing loom, away from alternator
- Screw-lock connectors survive vibration
4. Camera Sealing: Washdown, Salt and Coach Wash
Coach wash bays and winter salt attack every exterior camera. Sealed housings rated for washdown, screw-lock connectors, and drip loops at every body penetration keep moisture out for the life of the vehicle. After each wash-bay cycle, glance at the lenses for spotting — the two-second check that keeps night footage usable.
- Washdown-rated housings
- Drip loops at penetrations
- Post-wash lens glance
5. Commissioning Checklist: The 20-Minute Sign-Off
Commissioning makes or breaks the install. The sign-off sequence: confirm all four channels on quad view, engage reverse and confirm auto-switching, verify timestamps against a reference clock, walk the bus and check every camera's coverage zone, format the card in-camera, and log the commissioning date. Twenty minutes — and the system runs for years without touching it. Dealer installers who follow this sequence have near-zero comebacks.
- Quad view: all channels confirmed
- Reverse auto-switch verified
- Timestamps checked against reference
- Card formatted in-camera, install logged