Listen to see if injector is working by using a long extension putting it up to your ear..no clicking then Worst case just bypass the whole harness injector ground. it’s just one wire ,then check the voltage at the box and the injector ,next get a known good part install it in harness listen to it if the other one wasn’t clicking ..if it runs fine with bypass harness then just go inch by inch on older harness untill you find short break etc..
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