I hve a 91 s-10 blazer 4x4 that has some electrcal issues. If I hit my horn my floor lights come on and the horn doesn't work. my rear hatch release stopped working. my temp guage stopped working and the speedo stopped working. my power mirrors will only work if the doors are shut. my dome lights on the roof don't work and if my glove box is open the light is on but if i open any of the doors it shuts off and the floor lights come on. Where do I start?