You are getting lots of great advice here
;
I also have that PWM charger, but do not use it any longer. Note, typically
the Victron requires battery voltage plus 5 volts to get the system to start
.
View attachment 196180
On the Victron unit;
Don’t use ferrules & use the right fine wire multi strand;
View attachment 196182
The above wire is “Marine Grade” ,,, You can buy it at a local Boat “Marine” Store.
Regarding Backlash ,,, This should never happen, but unfortunately does. The internet can be tough to get thru if you are learning about such things as this, but there are good Members on this Forum that just want to help you out. We all had to learn this stuff from somewhere, as none if us were born knowing it. It is very difficult for inexperienced DIYers knowing who to trust on the internet ,,, I get that. Unfortunately people come with egos & we all have to deal with that stuff. Stick it out & you will learn & have the knowledge. Everything we do comes down to “Knowledge & Motor-skills”. You seem to have a DIY interest ,,, Hang in There it gets easier !!