Very weird problem

[pipeliner_78]

On my 1990ish Ford Ranger, I am having a problem. When I hook the connector to the clutch interlock switch that is on the clutch rod, the truck begins to run rich and very rough. But when the clutch interlock switch is not on the clutch rod and just hanging freely, the truck runs just fine, but the turnsignals, headlights, and brakelights being used cause the truck to run rough and idle up. I have checked the grounds. I have found the engine, chassis, trans, and bed grounds. Are there some that I'm missing that could cause this? Can someone tell me where all the grounds are?

 

[norcals91]

Check your ground again all the way to where they go. MAy be corroded. I don't think it's directly related to your clutch interlock if other electrical circuits cause it too. Good luck