I've recommended a relay in the run circuit. The reason is that circuit supplies ANY underhood loads during "run," including the alternator field and VR. Voltage drop in that circuit........which is a common problem.......causes the charging system to run OVER voltage, because the VR power connection is also voltage sense. If it sees low (dropped) voltage "it thinks" the battery is low and ramps up charging voltage. There are two ways to check that. One is key in "run" with engine stopped. Compare voltage at the ballast from the key to battery+. Another is to run the car, battery charged, at high idle. Compare battery charge to the ballast "run" terminal. If the ballast runs at (correct)13.8--13.2, and the battery is higher, then you have a drop problem in that circuit
