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I'm pretty sure you've effectively shorted both to car and PSU ground. Black is PSU ground and car ground since the fan is still attached to the car. By shorting blue to yellow, you have shorted blue to ground through yellow. IMHO, best to leave yellow out of it as you're grounding through the ECU.
7.5A is probably pretty close. 6A didn't quite do it. I'm going to shoot for 10A. Amazon sells a few for under $20.
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