OBD [ On Board Diagnostic ] codes aren't that mysterious. Here is some guiding information
Relays are a great way of controlling high power items with a low power switch
LED's are agreat benifit for power consumption and brightness
Using relays to keep headlights from dinmming and upgrading to bigger badder lights
Using a relay to control multiple high power items.
Wire size in a project is critical. Pick the right one for the job
More info on picking the correct wire size
How to relocate the starter solenoid for better funtioning