2_Liter_Turbo

I'm having a little electrical trouble, and can't seem to pin-point the problem. Curious if anyone else has ran into this, and if so, if they found a solution...

This involves my 92 240SX with an SR20DET running on AEM EMS:

I turn the ignition switch to the full "on" position to run the fuel pump (engine not running of course). And the tachometer jumps around 500 to 1000 RPM, bouncing with the fuel pump signal. Pull the fuel pump fuse, and it sits still. So far I've checked all grounds in the engine bay and the ECU, and everything is good there. I'm assuming it's a grounding issue. Tomorrow I plan to cut the fuel pump ground and ground it separately through the chassis (been meaning to do this anyways). If it's not that however, I'm out of ideas.

Any suggestions?

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96 S14: Grip Track Car
90 R32: Bucket List Car
92 S13: Just for Fun Car
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