Originally Posted by ScottBrownstein
I finally replaced the fuse for the cigarette lighter on my 335DS today (it is right behind the receptacle under the dash. Wow...7.5 amps. No wonder it always blows. That would be a total wattage of 90 watts, including losses from the inverter itself. Forget the 150 watt units...they will just blow your fuses!!!!
I hope you didn't put a bigger fuse in without checking the wiring between the lighter socket and fuse panel. Fuse size has to be calculated to protect the wiring as well as the device on the circuit. 18 gauge wire would normally be rated at 7.5 amps.
If the lighter itself is rated to 15 amps, you need 14 gauge wire to support 15 amps (and a 15 amp fuse) without overheating. Note that even a 15 amp circuit will only power a 175 watt maximum input inverter.
the one who managed to start an electrical fire with paralleled 12V batteries and 6 gauge cables
2014 Rockwood A122 A-frame (now with 6V golf cart batteries!)