Engine wiring harness replacement, diagrams of the total location of the harness wrapped around the engine needed?

This should be able to be done without removing the engine though you might need to remove some accessories such as an alternator etc. You will need to start by disconnecting the battery and removing the air filter housing. Then remove the main junction box (fuse panel) this will allow you to remove the main electrical connectors. Here are instructions in the images below to help you with the job, if you get stuck, please upload images of the problem so I can help walk you through the repair. Check out the images (below). Let us know how it goes.

Ken, you are a God Send! This is exactly what we needed. I will be sending out a donation next week, you guys deserve it. Thanks so much!

Jon

Ken,

A few more questions:
a. Are there any more instructions/diagrams that show how the harness circles around the engine, or are the harness cables fitted on top and sides of the engine?
b. How long do you think it will take to remove, then replace the harness?
c. Are you available to consult (for a fee of course) via live phone feed (say WhatsApp video or Google Meet)? If so, what part of the day (or night) would you be available? FYI, my best friend is an amateur wrench as is his oldest son, the father is not electrical skilled, but the son is somewhat skilled (he has replaced wire harnesses before, but not on a Sonic).

Thanks for spending the time here,

Jon

Hi Jon,

This is all the instructions we have. It should take you about 3 or 4 hours to do the job depending on experience and the works area conditions. I can help through this site if you upload short videos of the problem, I can walk you through what to do no problem. If you get started, we can help you step by step.

Okay, what hours during the day are you least busy?

I am here all day, just add to this post and I can help.

Okay, I will do it, we are looking at doing the replacement tomorrow starting around 10AM EST.

Thanks again for all your help.

Jon

You are welcome good luck on the job, let me know. :)