Symptoms
- No lights on the charger when plugged into the 12V socket
- Charger works in one car but not another
- Socket also doesn't power other accessories
- Charger only works when wiggled
Likely causes
- CommonBlown fuse for the 12V accessory socketA single blown fuse disables that socket while everything else in the car works fine.
- CommonFaulty or worn charging cableCables that flex constantly in a car take a lot of wear and fail often.
- PossibleCharger itself has failedCheap car chargers commonly fail after exposure to heat and vibration.
- PossibleLoose or corroded 12V socket contactsCoins or debris in the socket can block the center pin.
- Less commonCar battery too low to power accessoriesA very weak battery can cut accessory power before it fails to start the car.
What to do
- Check for anything else that plugs into the same 12V socket, like a dash cam, to confirm the socket itself has power.
- Look in the car's fuse box (check the manual for the accessory or cigarette lighter fuse) and inspect it for a break.
- Try a different charger in the same socket to rule out the charger.
- Inspect the socket for debris, coins, or lint and clean it out if needed.
- Try the same charger in a different vehicle or a different socket in the same car if it has more than one.
- Replace a blown fuse with one of the same amperage rating, never a higher one.
Tools and parts
- Flashlight
- Replacement fuse of correct rating
- Fuse puller (often built into the fuse box cover)
Car accessory socket fuseSearch: “car 12V fuse replacement”
Replacement USB car chargerSearch: “USB car charger adapter”
When to call a pro
If the fuse blows again right after replacement, have a mechanic check the accessory circuit for a short.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.