Ok i have a 2007 dodge ram 1500 hemi with a 5.7litre,its electonic. ok i have the 4wd serve light on as well as the engine light, abs light, and brake light. the speedo does not work but drives ok , what i found was broken wire to the rear differential sensor for the abs i repaired it thinking it would clear the abs light but the light is still on, as well the others are still on.what are the cause of all the lights coming on at once