There are a lot of electrical queries on the forum , and many are simple to resolve . It seems a lot of folk dont even have basic stuff , to eliminate other underlying issues . May I suggest a simple kit to point the way ?? First , a very cheap meter to show continuity (not getting into amps, ohms , etc. at this time ) !! Then . a test bulb , 12v . ( it could be a 12vinspection lamp , or just a bulb on a couple of wires ) then , a couple of suitable lengths of wire with male/ female connectors .... A couple of croc. clips to fit the wires , and you can check soo much .. !! Its a very versatile bit of DIY meccano , and if you have a more complicated prob . it eliminates a lot of basic issues ... !