electrical troubles

I seem to be having trouble with my 89 S10. Light switch on, dimmer switch being used (not in the interior light on mode), door open and I get both turn signals on and if the high beam is turned off the high beam light will also be on. If I put the high beam on the indicator light will go off.Also the dash "illumination" lights are not on. Now if I roll the dimmer rheostat to click to the interior light "on" position, the turn signals and the beam indicator go off and everything runs as normal and now my dash lights work(Door open). Now if I close the door I go back to the same problem. This is all with the key off. Key on same thing. If I turn the ignition on and use the dimmer rheostat I can control the temp guage. Sounds like fun? I think it might be the ground wire from the light switch to the frame, some other guy had same prob, said he found a splice in that wire. Possible any one knows where and how i can find this ground? Thanks
My experience on electrical. If it doesn't make sense its a ground problem.