[Jamesp]

What I would do:

Disconnect the battery

Take out the seat again

Pull everything apart

Check to be sure you've accounted for all connections, that they are all fully connected.

Check each connector for bent pins or bad connections (trash caught in the connector, etc.)

Carefully re-assemble everything looking for any missed connections or mistakes that could have happened the first time though.

connect the battery

Best of luck!