1. It is possible for some chargers to be inserted in reverse so that out of work. If so, please pull out the plug of charger, and change its direction,
insert into the car converter again.
2. This car is designed for those car with negative line connecting ground; and not available with those car with positive line connecting ground.
3. It is normal phenomenon if car converter feels a little warm while charging; Temperature under 65 degree is acceptable.
4. This car converter is not available with those charger with core transformer.
5. Do not apply the car converter to other usage without professional advice.