Slava- the tow vehicle will provide about 2 amps of power; which should be enough to register on a meter. However I know my truck has to be running to send power. Otherwise if you leave your trailer hooked to your truck you could kill both batteries.
For troubleshooting you could use a car battery. But don't use it long term; car batteries are designed to provide a LOT of power quickly to start a car, not slow release like a deep cycle battery.
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