How Do I…Install a Dash Cam and Interior Camera in a Fleet Vehicle?

From the API Signal install team.

A camera install is a mounting job and a wire-hiding job. The wiring is simpler than a tracker. Getting the camera in the right spot, aimed right, with the wire completely out of sight, is where the work is.

This covers road-facing, dual-facing and separate interior cameras.

What is the difference between road-facing, dual-facing and interior cameras?

Road-facing. One lens through the windshield. It records what happened in front of the truck. This is evidence hardware.

Dual-facing. Same housing, second lens pointing back into the cab. One unit, two views, one power wire.

Separate interior camera. A second camera on its own, mounted where the dual-facing lens can’t reach: a sleeper, a box, a passenger area, a bus. Runs back to the main unit or its own recorder.

AI cameras. Any of the above with processing on board that flags events in real time. Same install, more attention to aiming, because the software is judging what it sees.

Which one you’re putting in changes the driver conversation more than it changes the wiring.

What do I tell the driver about an interior camera?

Have this conversation before you mount it, not after.

The camera installs that go badly are the ones where the driver found out by noticing a lens pointed at his face. He pulls the fuse, tapes over it, or unplugs it, and now it’s a warranty call and a bad day for everybody.

Two minutes of straight talk fixes it. Tell him what the camera sees, when it records, and who looks at the footage. If the fleet manager hasn’t told the drivers yet, say so to the fleet manager before you start. That’s not our conversation to have for them, but it’s our problem when it goes wrong.

Where does the camera mount on the windshield?

High and centered, behind the rearview mirror.

• High on the glass, up in the shaded band at the top if the windshield has one
• Centered behind the mirror, where the mirror body hides the camera from the driver’s eye line
• Clear of the driver’s field of view. Some states are specific about what can be stuck to a windshield. Behind the mirror is the safe answer everywhere.
• Clear of the sensor pod. Modern trucks have lane-departure cameras, rain sensors and auto-dimming sensors up there. Do not cover them or crowd them.
• Where the wipers actually clean. A camera looking through a spot the wipers miss is a camera that gives you a smeared clip on the one day you needed it.

Clean the glass with alcohol and let it flash off before the adhesive touches it. Not glass cleaner. Glass cleaner leaves a film and the mount falls off on the first hot day.

Get it right the first time. Pulling an adhesive mount off a windshield leaves a mark, and moving it is the most common visible mistake on a camera job.

Where does a separate interior camera go?

Depends on what the customer needs to see, but the rules are the same every time.

• High, in a corner, looking down across the space
• Out of reach of anyone sitting in it
• Not pointed straight into a window, or every daytime clip is a silhouette
• Not where a sun visor, a headrest or a hanging jacket blocks it
• Wired the same way as the main unit, through the headliner and down a pillar

Sit in the seat and look at the camera before you commit to the spot. If you can reach it, so can the driver.

How do I run the power wire?

The wire should be invisible. Every inch of it.

1. Tuck the wire up into the headliner at the top of the windshield. Use a nylon trim tool, not your fingers, and not a screwdriver.
2. Run it across to the A-pillar on the passenger side, or the driver side if that’s where the power is.
3. Open the pillar trim carefully. Almost every modern vehicle has a curtain airbag in that pillar. Route the wire so it cannot be in the path of that airbag or wrapped around anything the airbag pushes. When the pillar has an airbag warning label on it, believe it.
4. Down behind the pillar trim, along the door seal, into the kick panel.
5. Into the fuse panel or up to the ignition switch harness.
6. Tie it off every 8 to 12 inches. Leave a little slack at each end.

Tuck the wire, don’t stuff it. A wire pinched under a pillar clip is a wire that opens six months later.

How do I power a dash cam?

Most fleet cameras want two power connections, not one.

• Constant 12 volt so the camera can record while the vehicle is parked and keep its clock and settings.
• Ignition so it knows when the vehicle is running, and so parking mode knows when to drop into low power.
• Ground to bare metal, ring terminal, star washer.

Fuse the constant at the source. Fuse taps at the panel are fine, load side, tap fuse matched to the wire you’re adding.

Parking mode is where cameras kill batteries. A camera recording all night on a truck that sits over a weekend will flatten the battery, and the customer will blame the camera, then blame us. Either use the camera’s low-voltage cutoff, set it, and confirm it, or use a battery protection module. Do not leave it on the factory default and hope.

If you’re plugging into the cigarette lighter because it’s fast, understand that most of those sockets die with the key, which kills parking mode, and the cord will be visible. We hardwire.

How do I aim and focus the camera?

Aim it with the app or the platform live view, not by eye.

• Road-facing: horizon roughly a third of the way down the frame. Too much sky and you lose plate detail on the car in front. Too much hood and you lose the intersection.
• Level. A tilted camera reads as a sloppy install and makes footage harder to use.
• Driver-facing: the driver’s head and shoulders in frame in a normal seated position, not the ceiling and not his lap. Check it with someone actually sitting in the seat, adjusted the way a driver would adjust it.
• Peel the lens film off. Yes, really. It’s clear, it’s easy to miss, and it will ruin every clip.

How do I test it before I leave?

1. Confirm both lenses have a clean, aimed picture on the customer’s platform or app.
2. Confirm the camera comes on with the key and stays on the way the customer expects.
3. Confirm it uploads a clip, not just that it powered up. A camera recording to a card nobody can reach is not a fleet camera.
4. If it has an event trigger, trip one and watch the clip arrive.
5. Confirm parking mode and the low-voltage cutoff are set.
6. Key cycle the vehicle. Make sure it comes back on its own.
7. Read the codes again and compare to the photo you took before you started.

Then clean the glass, wipe your fingerprints off the headliner and the pillar, and put every clip and screw back.

What goes wrong most often?

• Mount on dirty glass. It falls off in the first heat wave.
• Lens film left on. Every clip ruined and it’s a return trip for nothing.
• Camera crowding the factory sensor pod. Lane departure starts throwing faults.
• Wire routed through the curtain airbag path. The worst one on this list. Don’t.
• Parking mode left on default. Dead battery Monday morning.
• Driver never told about the interior lens. Camera comes back taped over.
• Left without confirming a clip uploaded. The camera was never the deliverable. The footage was.

This information is provided as a guide. Verify every circuit with a digital multimeter before connecting to it. Proper installation is the responsibility of the installer.