Wiring up a set of electric trim tabs is not as complicated as it might seem. Especially once you know about the wiring that goes to the system.
They are a basic, typical electrical circuit type of system, with basically power coming in, and power going to each actuator. Making them a really easy fix, addition, or item to replace on the boat.
Here are some courses that you should know before working on the trim tabs:
Troubleshooting An Electrical Circuit: https://www.bornagainboating.com/lessons/troubleshooting-an-electrical-circuit/
Electrical Basics Lessons: (Click On Electrical Basics): https://www.bornagainboating.com/course-dashboard/
Wiring Lessons: (Click On Wiring): https://www.bornagainboating.com/course-dashboard/
Where to Find Information: https://www.bornagainboating.com/lessons/finding-instruction-manuals-manufacturer-phone-numbers/