I'm not sure on the wiring, but if one ballast is piggy backed off another ballast, the one which is piggy backed may have issues?

I understand the ballasts as being like a big capacitor yes? So when you turn the car on with the lights on, the one closest to the battery comes on first, as that the one which comes up to full current first .. And then the other one comes up?

Make sense? I'm not sure if this is the issue, but it kinda makes sense?

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Should have bought an STI