I have no power to my Cerbo gx. I have made sure that my polarity is correct going into the Cerbo. I am connected directly to a fused dc distribution block that is grounded to chassis ground. I have checked voltage from the block to the pins on the power cable to the connector. It shows 11.9 Vic. I connect the wires to the 2 pin connector again checking polarity. I have the positive connected to the pin closest to the edge of the Cerbo and negative to the pin that is closest to the middle. No power on the Cerbo. I bought a new Cerbo. No power. I’m at a loss. Can you help.
Did you checked the fuse and measured the voltage at the pins?
Please see above. Fuses, etc checked.
The polarity is marked on the Cerbo… so it shouldn’t be too difficult. 
Did you plug the connector in tight? 
11.9 looks a strange voltage, perhaps you have a high impedance somewhere? The Cerbo should run from 8V upwards (to 70V), so you need to check the continuity of the Cerbo power lead (again), and measure the voltage on the terminal block with the cerbo plugged in.
If still no lights on the cerbo, then this should be bench tested, and the pre-RMA tests followed.
Got it figured out. Grounding issue. Thanks for your help.
Fine and a lot of fun with the Cerbo
Do you have instructions for diy bench testing?
What was the grounding issue? Grounding on what?
Probably to the vehicle chassis = minus
I had several points of contact for my DC grounds. Cerbo said no, don’t like this. Took all my grounds to one central point. Cerbo said it’s happy hour!
Correct sir.
1 Like
Have a lot of fun with your new Cerbo GX
No. Easiest way is to draw your layout on paper the way you have it all hooked up. Make sure that your grounds are going to one central point. Example: battery negative to bus bar. Bus bar then has all the negatives from your devices attached and then one wire off of the bus bar to chassis ground.