so you've determined the controller is not sending the current necessary to operate the pump. Measure the CURRENT that it does send by putting your multimeter inline and provide a very good ground to the other terminal and check the connectors very carefully. You should then be able to isolate it between connectors, wires to the pump or the controller.

__________________
'82 300SD - 361K mi - "Blue"

"Good judgement comes from experience. Experience comes from bad judgement."

listen, look, .........and duck.