where can I find how to put an engine harness on

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my machanic changed a main seal and was not able to put the engine harness back the way it was and now it won't run. He says he's waiting on his friend who has a car like mine so he can look at his engine harness to see how to run the wires. He's had my car going on two months now. Is there a refernce source for this anywhere. I feel like I don't have a car anymore. I love my car and I need it now! HELP