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Did you mean that when you connected the idiot light wire, everything started going down hill? If so, the idiot light wire is likely shorted which is why someone removed it from the regulator in the beginning.

First thing you'll have to fix is the short in the wire leading to the idiot light. Chances are someone drilled a screw through the harness and shorted it out (installing an aftermarket radio for example) or it is chafing a metal part in the dash or who knows what. You'll have to find out where the short is and then fix it before hooking the loose end back up to the regulator. Troubleshooting this takes some electrical knowledge so find an electrician or electronics technician to give you an assist.
 
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