You can check the tender connection with a Voltmeter. Check for continuity from the tender truck rivets to the female jack on the tender. If you wiggle the wire and lose continuity, hit the solder joint with an iron or restrip the wire and resolder. Be careful with the length of time you apply the iron as the jack is sitting in a plastic tender shell. Use the same technique to check the engine plug. It is a common problem that the wires pull loose from the plug. Replacements are available.
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