You should be getting nothing like that voltage drop with that gauge wire over that distance.
I am not sure how this problem (of maybe a bad conection) is producing your symptoms. However, if there is a defective conection somewhere I would always suspect this of the cause of problems, rather than defective new equipment
, which is rare.
I would trace with a multimeter where the voltage drop is occurring. Another option is to wire the CC directly to the battery
(use a fuse) with some scrap (thick) wire and see if it performs OK.