I suspect you know that you can install a 12V motor.

On the website link above there is a Q&A.
The attached is a response. It says you can tie both black wires together as a neutral.
DC voltage doesn't have a neutral like AC but both black wires will be connected to a ground.
Attachments
Voltage Drop.jpg (14.34 KB, 52 downloads)

Last edited by buoymaker; 07/05/2021 8:54 PM.
"Adding CFM to a truck will only help at engine speeds you don't want to use."
"I found there was nothing to gain beyond 400 CFM."