blowing a 20a and 30a fuse instantly

Gdetrailer wrote:

blaczero wrote:
Plugged a USB charger into cigarette port, works fine

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 (-).

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).