blaczero wrote:

Plugged a USB charger into cigarette port, works fine

Gdetrailer wrote:



Recheck the wiring to the cig port, it still can be reversed and a plug in USB charger still work. Plug in power port USB chargers may have the ability to operate with reversed polarity since they could be used in older vehicles with a positive ground.

Your inverter however may not work at all with reverse polarity and may have a reverse polarity diode which acts like a short when reverse polarity happens..

Looking at the back of your power center it is easy to switch the pos and negative wires although this one I picked does have pos (+) and neg (-) markings.



You need to ensure the center connection inside the power port is correctly connected to the positive of your 12V system.

You can verify the correct polarity with using a DVM set to volt meter if you have one by touching the red lead to the center of the port and the black lead to any 12V ground. The voltage on the DVM should read positive and should not indicate (-).

blaczero wrote:



Thanks!!!

Every bronze connector on the panel is ground, except the cigarette lighter. I had the wires on wrong!

Good info on the multimeter, I had tested it but didn't know which should be + (side or all the way in).

Gdetrailer wrote:



Excellent!



I had thought about mentioning the brass color may be positive which would typically follow other electrical guidelines but was concerned not all were marked that way..

Max fuse size also should be selected to protect the wire.

12Ga = 20A fuse..

10Ga = 30A fuse..

While there may be a few exceptions to that rule, it is very wise to follow typical recommended fusing sizes for the wire size in use. You really want the fuse/breaker to pop before the wire over heats and causes a fire.

Just be aware 20A at 13.8V is 276W max your inverter will be able to supply. Might handle a quick surge above that before fuse blows but that should be fine.