[Pat]

Something may be wired incorrectly. The pump switch has three positions for off-left-right pumps. One pump should only be on in one switch position.

You may want to pull the leads on the right pump and see if any of the positions send power to it. Compare the color of the lead to the schmatic in the handbook and see if the right pump is wired to the switch. If they don't match my money would be that you don't have the right pump wired to the switch and have the left pump wired to either a two position switch or both hot leads to the left pump.

Hope that helps.