Flyinlo, that is because I don't know anything at all about the charger. I am a former auto tech. A lighter is usually fused at 10a. If you had a problem with the charger it would be better to blow the courtesy fuse. I assume you are using the trailer plug for your trailer, blowing that fuse could have any number of consequences. I mentioned my charging system only as how I handle the charging of my planes. Tim