The first thing I would check is the ground on the converter. Make sure it is attached to a clean bare metal surface on the vehicle. A bad ground can cause all sorts of problems and the problem is likely to show up once more power is applied to the system; in this case turning on the running lights.
Another possible cause is too much amperage draw from the lights on the trailer. A trailer than has a lot of lights on it could overload the converter causing it to malfunction. You would need... view full answer...
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