The pump wasn't working. Checked the resistance at the pump as recommended, looked good. Checked the resistance at the connector at the heater, through the pump, open loop. Checked the resistance of the cable from the heater to the pump, looked good. That didn't make sense. Cleaned up the pins (they looked fine), and tried it again, resistance at the pump looked right this time so I plugged it in and tried it again thinking the pins must have had a little corrosion. It failed again & when when I measured ohms it was open loop again. So I had the SO watch the meter while I wiggled the connector on the pump. It moved a little, but mostly OL. I'm thinking I need to order a new pump, but since it failed after quite a few months of non use, & it's a solenoid I think it's worth a little tapping. The tapping didn't seem to do it, but I also put the charger in equalize mode to bump the voltage to 16 and a little tapping & I got it working. After letting it get cold overnight it worked again the next day!