Listen to poodles
Have you checked all the grounds ? I believe theres 5 give or take. Have you tested continuity ? Im pretty sure if you do this youll figure it out yourself
I can see your new here so heres what i suggest. A DIY mechanic should have these basic tools in his tool box (other than the obvious tools such as ratchets with all measurements) Multimeter, timing light, logic probe i might be missing somethings but this is all i can think of at the moment. The last two dont apply here but this is all you basically need to work your way around the car and fix any problems that might occur.