The trailer battery has nothing to do with the exterior trailer lighting circuits. If you have an issue with your trailer lights which was caused from the trailer sitting then I would first start by tracing the wires for each light up to the trailer connector and then rechecking the grounds for each light as well. If they still do not work after then this your best option is to just rewire the trailer as the issue with intermittent function is only going to get worse over time. For this,... view full answer...
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