Inverters, like most electronics, typically have two states: working perfectly and suddenly not working at all. Some internal components fail for whatever reason and nothing happens when you plug them in.
Reasons Why a Car Inverter Can Suddenly Stop Working
The bad news is that if your car’s inverter suddenly stops working, chances are it’s broken. In that case, it’s cheaper to buy a new one than to repair the broken one you have. The good news is that there are a few things you can check before throwing in the towel.
Since inverters work by converting a 12V DC input voltage to 120V AC, it stands to reason that your inverter will not work if it does not have a good connection to your vehicle's electrical system. Therefore, check that the connection between the inverter and the electrical system, or the booster battery if you have one, is solid and that the electrical system is working properly.
If your inverter is connected to the cigarette lighter socket on your dashboard or its replacement (a 12V socket commonly found in modern cars), there are a few things that can cause the 12V socket to fail.
