Can you put the OE lights back in, just to remove that excuse.
Anything is possible, so it's best to give them as few excuses as possible.
But, their theory is highly unlikely. The headlight circuit has protection, the ecm circuit has protection, the ECM solid state board itself has protection....
Ask to see, where in the service manual diagnostics their testing showed the headlights are causing this problem. Page, step number, and test result. If they can't explain the specific diagnostics, those ass clowns are just guessing.
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