G5 new coolant pump replacement will not work

Hi, I have researched the internet and found a vast amount of good help regarding the replacement of the coolant pump installed in some G5 towers. However, after installing a brand new Swiftech MCP350 coolant pump and filling the system with coolant, I can not get the pump to operate. To test it, I am using a bench power supply at 12 volts and current limited to 2 amps. I have not modified the wires from the pump at all. When I connect 12v to the yellow wire and ground to the black wire, the power supply voltage drops to 0 and the pump does nothing. Am I doing something wrong?

Hi madroadbiker,
when replacing your G5 (Delphi?) pump with the new MCP350, do you remember how you wired it to go from three wires to four?
I have just got a Laing pump, which should be identical to the Swiftech. It has three wires (black/blue/yellow = ground/tacho/12V) and a blank connection on the PCB. I'm wondering if that blank could go straight to the fourth wire and provide variable speed control?
Other threads speak of a bridge between two pins on the PCB, one of which is the 12V and the other the variable speed, but my PCB (DDC3.1) just has a blank connection at position 3 as you look at it. Any info would be much appreciated.

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G5 new coolant pump replacement will not work

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