I have a 69 roadrunner I just picked up it has a charging problem the alt. has been replaced the batt is good but I keep blowing voltage regulators. The ballast resistor looks like it has a jumper between posts. Anyone have any ideas?

 

There are cheap voltage regulators that this is common with.

 

I replaced the old with new one and I started up and it up and started smoking. It looked ok inside.

 

What is your running battery voltage? Do you have voltage drop across your chassis to battery ground?

 

Running voltage is only 12v.

 

you DID check grounds, didnt you? have any stock / O.E.M. ground strips been removed and not put back. i got in the rabbet of adding ground straps to voltage reg, E.C.U... once i even grounded the points in the dist, and they lasted much longer.