ECU shortage

Hey guys!

I’m currently working on a 98’ Nissan Skyline GT with an AEM 10-951 plug and play series 1 ECU. Theres a shortage causing the battery to drain only when the ECU was plugged in >0.5 A, without plugged in it was 65 mA.

Fairly new to cars so any and all advice is helpful. Pinout is attached.