On 21/11/2018 23:22, Pete Zahut wrote:

2. Does anyone know what the red box arrowed in the second photo does
and/or what it contains? Do I need one or will it be alright to just run
a positive and negative wire from the battery to a female Powerpole
connector (if that's what it is) without that red box?

It's a diode pack to prevent the alternator (possibly) overcharging the
battery pack when the engine starts.

Described by Big Clive in https://www.youtube.com/watch?v=F8zghvQZYNM