That is a very bad wiring effort and WILL fail, it needs to be done properly with a crimped join or soldered .
As for grease points check the tail shaft uni's one or two pumps is fine the front steering you'll find one side has
sealed ball joints so again only a couple of pumps of grease will do. As for the grease I have no idea they
are some extremes in temperatures thats for sure. Get that wire fixed properly first though.
is your battery a start or AUX [2nd] battery? a start battery needs CCA's so a 650 CCA plus would be fine
I run a 115 AH aux battery and a 750CCA start battery