Dash Cam Fuse Keeps Blowing: Causes and Fixes

Start with the circuit

A fuse blows when the current flowing through a circuit exceeds the fuse's rated capacity. Dash cams draw very little power, so a repeated blown fuse is almost never caused by normal operation. It means something in the power path is shorted, or the fuse tap is drawing from a circuit that cannot handle the load. Motor vehicle crashes are a leading cause of death in the US, killing over 120 people every day, so a dash cam that keeps losing power is worth fixing promptly.

Before you buy anything, confirm which fuse is blowing. If it is the fuse for the cigarette lighter or accessory socket, test your dash cam with the original power adapter in that socket. If the fuse still blows with no dash cam connected, the problem is in the car, not the camera. If the fuse only blows when the dash cam is plugged in, move on to the hardwire kit.

Shorted hardwire kit

A hardwire kit is the most common cause of a repeatedly blown fuse. The kit taps into a vehicle circuit and converts the car's electrical system to the voltage the dash cam expects. If the kit's wires are pinched behind the trim, the insulation is melted by engine heat, or the voltage converter fails, the kit can short the circuit and blow the fuse.

To test the hardwire kit, unplug it from the dash cam and replace the fuse with one of the same rating. If the new fuse holds without the dash cam connected, the hardwire kit is likely at fault. If the fuse blows even with the kit unplugged, inspect the fuse tap and the wiring behind the trim. See how to install a dash cam hardwire kit for the correct steps.

Some hardwire kits include a low-voltage protection feature that shuts off the camera before the car battery gets too low. A faulty protection circuit can also cause a short. If the kit has been damaged by water or heat, replace it rather than trying to repair it.

Wrong fuse tap position

A fuse tap has two slots: one for the existing vehicle fuse and one for the new dash cam circuit. The blade orientation matters. If the tap is inserted backward, the dash cam may draw power through the vehicle fuse instead of its own fuse, which can overload the original circuit and blow fuses.

Use a fuse tap with the correct fuse size for the dash cam circuit, and seat it fully in the fuse box. A loose tap can cause intermittent shorts that blow fuses only when the car hits a bump. Also check the tap's wire gauge and connector quality. A thin wire or loose connector can overheat and short against neighboring terminals. See how to choose a dash cam fuse tap before reinstalling.

Check the fuse rating

Never replace a blown fuse with a higher-amperage fuse. The fuse rating is chosen by the vehicle manufacturer to protect the wiring. A higher rating can allow the wiring to overheat before the fuse blows, which creates a fire risk. Always use the same rating that was in the slot originally.

If you are using a fuse tap, the dash cam circuit should use its own fuse at or below the rating recommended by the dash cam maker. The original vehicle circuit keeps its original fuse. A mismatch in fuse size or fuse tap orientation is a common reason a dash cam fuse keeps blowing after installation.

Damaged cable or dash cam

A damaged power cable can also blow fuses. Check the entire cable from the dash cam to the fuse tap for cuts, melted spots, or exposed copper. Pay special attention to areas where the cable passes through the door jamb, under the seat, or near metal brackets. Replace the cable if you see any damage.

If the hardwire kit and cable are fine, the dash cam itself may have an internal short. Test the camera with a known-good USB charger in a different vehicle, or use the original cigarette-lighter adapter. If the fuse blows there too, the dash cam needs to be replaced. Read dash cam repair vs replace before deciding.

Diagnostic checklist

Use this checklist in order. Stop as soon as you find the blown fuse cause, and replace any damaged part before testing again.

• Turn off the ignition and remove the blown fuse.
• Insert a new fuse of the exact same rating.
• Connect the dash cam with the original power adapter first.
• If it holds, install the hardwire kit and test again.
• If the fuse blows, disconnect the hardwire kit from the camera and retest.
• Inspect the fuse tap orientation and fuse size.
• Check the cable for damage.
• Test the dash cam on a separate circuit.

When to replace instead of repair

Replacing a fuse over and over is not a permanent fix. If you have checked the hardwire kit, fuse tap, cable, and camera, and the fuse still blows, the safest move is to replace the damaged component. Driving with a shorted circuit can damage the dash cam or the vehicle's electrical system.

If the dash cam itself is the cause, consider a newer model with a more reliable power design. Look for dash cams that include a hardwire kit or have clear guidance on fuse tap installation. A hardwire kit vs external battery comparison can help you decide whether to stay with a fused vehicle circuit or use a separate battery pack.

What to pick for your use

Questions

Can a blown fuse damage my dash cam?

Usually no. The fuse is designed to break the circuit before excess current reaches the camera. But if the underlying short continues, it can stress the power components over time. Find and fix the cause before using the dash cam again.

How do I know if my hardwire kit is shorted?

Unplug the hardwire kit from the dash cam and replace the fuse. If the fuse holds without the camera connected, the kit is likely shorted. If it still blows, check the fuse tap and cable.

What fuse tap should I use for a dash cam?

Use a fuse tap that matches the mini, low-profile, or micro fuse style in your vehicle. Choose the correct fuse rating for the dash cam circuit and insert the tap so the dash cam circuit is protected by its own fuse. See how to choose a fuse tap for details.

Why does my dash cam keep blowing the cigarette lighter fuse?

If the original charger blows the cigarette lighter fuse, the charger or the dash cam has a short. Try a different charger. If the fuse still blows, the dash cam likely needs replacement.

When should I replace the dash cam instead of the fuse?

Replace the dash cam when you have tested it with known-good cables and adapters and it still blows fuses on a separate circuit. That points to an internal short.

Do I need a professional to fix a blown dash cam fuse?

If you are comfortable working with fuse boxes, start with the diagnostic checklist. If the short is inside the vehicle wiring, or you are unsure how to test safely, have a professional handle it.