I would not use any type of splice as the line is under pressure and it would probably leak. You will most likely have to trace the line to see how much you need and what type of fittings are on the ends.
Your battery is not charged. Need 13.4 and the clicking is the auto reset on the fuse. Find the line from pump to that fuse and replace with an 80amp fuse.
Check out this
Do you mean that when you pull the handle that it does not open the valve??
Are you sure that it is ready to be dumped??
When was the last time(# of days) you dumped that tank??
Does your Newport have the 1/2 bath??