You are going to have to start being absolutely specific
"What" doesn't work?
"What" are the problems?
"What" is the voltage readings that might be wrong. You must post specific wiring/ connection/ termination points, referenced to the FACTORY diagram.
"Let's say" the headlights don't work. I/we would ask "both high low beams?" And would probably tell you to pull out the dimmer switch and take measurements down there "to start." Just an example
