Board Question

[aerodev434]

Hello, thank you very much for this schematic!

Hope you don't mind if I post a question here.
On the D4184 board do you think this situation would cause a short:

1. Directly connecting Vout+ and Vout- by connecting a wire to both (at the screw terminal)
2. Connecting power to Vin+ and connecting Vin- to a Load, which is grounded to the chassis.

When the MOSFET is turned on, would this cause a short between the VOUT- (Drain) to VIN- (Source) and 5V GND. I suspect the buck converter does not provide isolation between the 5v gnd and 12v gnd.

It's this converter here: https://www.amazon.com/Regulator-DROK-Automotive-Waterproof-Transformer/dp/B081RMFSCG

I would certainly appreciate your or anyone else's input on this. Thanks!

I posted 2 diagrams.
The first is the D4184 Connections
The second is the whole circuit, the D4184 sits on the right side.

[aerodev434]

Update: I tested the above, here's the finding:

Everytime the MOSFET is switched on with the above wiring configuration, it blows the fuse. This leads me to believe that the connection at the Drain (12V+ in this case) is being shorted to ground through the 5V GND line at J1 probably because the buck converter does not provide isolation.

I'm updating the image above with a note to not follow it.

I tried to remove the 5V GND line at J1, in this case the MOSFET does not seem to be conducting at all.