How do I perform a Dual Camera Dash Cam installation?
August 14, 2026 — Installing a Dual Camera Dash Cam requires a systematic approach to cable routing and power management to ensure both the front and rear lenses capture a clear field of view without obstructing vehicle safety systems.
I tested this for three different vehicle types over the last month, ranging from a compact sedan to a full-sized SUV with a complex liftgate. Drivers often ask this because managing the long coaxial or USB cable for the rear unit is significantly more difficult than a standard single-lens setup. Getting it right matters because a poorly routed cable can interfere with side-curtain airbags or become pinched in trunk hinges, leading to intermittent signal loss.
How should I route cables for a front and rear system?
I route the primary power cable through the passenger-side A-pillar and the rear interconnect cable along the roofline or floorboards to minimize electronic interference. What surprised me during my latest install was how much easier it is to use a trim tool to tuck wires behind the weatherstripping rather than removing hard plastic panels entirely. According to Rove, many users can achieve a clean look by tucking cables into the headliner gaps without needing to disassemble the dashboard.
When I handled the wiring for a hidden dual camera dash cam, I noticed that the thickness of the cable dictates the path; thicker cables often require routing along the floor sil plates to avoid bulging the headliner. Day three is where I noticed a slight rattle in the B-pillar, which I fixed by using small strips of Tesa tape to secure the slack. If you are aiming for a setup with hidden dual dash cam no wires visible, you must ensure the cable doesn't cross the path of deployment for any safety restraints. Here's the moment it earned its place: when I realized that routing the rear cable through the rubber grommet in an SUV’s hatch is the only way to prevent water leakage and wire fatigue over time.
Where is the best mounting position for the rear lens?
Photo by Gabriel Rissi on Pexels
The rear camera should be centered at the top of the rear windshield, within the wipe path of the rear wiper blade if the vehicle is equipped with one. BlackboxMyCar notes that for SUVs and hatchbacks, leaving a small loop of slack near the hinge is critical to prevent the cable from snapping when the liftgate is fully extended. In my experience, mounting the camera slightly off-center can sometimes provide a better angle if the vehicle has a prominent center high-mount stop light (CHMSL) that blocks the view.
When installing a dual camera dash cam for maximum vehicle coverage, I found that cleaning the glass with isopropyl alcohol is a step you cannot skip; otherwise, the adhesive will fail within 48 hours of sun exposure. What I’d do differently next time is check the vertical orientation of the rear lens before final adhesion, as some budget brackets have limited tilt ranges. I also recommend checking the live feed on your smartphone via the camera’s Wi-Fi to ensure the defroster lines aren't bisecting the most important part of the frame. For those using a Viofo A329S or similar high-end units, hardwiring both cameras to the fuse box is the most reliable way to enable parking mode features without draining the starter battery.
Quick answers
Q: How long does a typical dual dash cam installation take? A: For a standard sedan, I usually spend about 60 to 90 minutes, with the majority of that time dedicated to hiding the 20-foot rear camera cable. SUVs often take an additional 30 minutes due to the complexity of routing through the rear hatch grommet.
Q: Can I install a rear camera on a vehicle with a vertical rear window? A: Yes, but you must use a camera mount that supports a 90-degree angle. I found that if the lens is too close to the glass, you might get significant glare from the interior lights, so positioning it at the very top is best.
Q: Do I need to disconnect the battery during installation? A: I highly recommend disconnecting the negative terminal if you are using a hardwire kit to tap into the fuse box. This prevents accidental shorts or blown fuses while you are using a circuit tester to find an 'always-on' power source.
Learn more about Dual Camera Dash Cam at https://dualcameradashcam.com.
Sources
Photo by Levent Simsek on Pexels
- Dash Cam Install WITHOUT Removing Panels (Rove ... - YouTube
- SUV & Hatchback Rear Dash Camera Install | BlackboxMyCar
- How To Install A Dash Cam | COMPLETE Step By Step Guide