DSC Club Member
Big Twin
Posts: 1,600
Join Date: Oct 2004
Location: Sevenoaks
Mood: Im Going to Italy soon!
I would suggest that even though it would appear that the battery terminals are tight it sounds as if you have a poor quality connection on at least the positive.
It will low small amounts of power to the pump, but breaks down when you put the big load of the starter on it.
The same problem may well cause charging problems.
Chris