I have a 2006 mercury 25 hp 4 stroke. The high pressure VST pump has power going to its connectors. As soon as I plug the pump to them, they lose the power going to them. I have 2 pumps, both of them work when I test them on a battery. When I unplug the pump, the power returns to the connectors. I don't get it. People I talk to don't get it either. Please help.