In your pic. Those 2 large cables are on the ONLY solenoid on your system. Jumping those 2 large cables together will cause the pump to run. IF when you do that you get a large spark, then the problem may be
1. Battery cable has bad low voltage or corrosion
2. the motor is locked
3. I have rarely seen motor locked. Usually it is just DEAD.
4. Just because you changed the batteries means NOTHING. The batteries may be good, but the supply from those batteries to the various 12 volt systems is the problem. Any Ground cable or positive cable that is corroded or loose means loss of power. The HWH pump ground is to the mount on the frame.
5. Odds are the motor is bad, if you can move the battery cable connected to the lug on that motor, then it is burnt out. The cable should not be able to wiggle and move. Doug
