Hi Tuga,
No, that does not mean for sure your merge solenoid is working. What it means is that the coil portion is drawing current and you feel the result of that with the warmth. The coil ( solenoid ) makes a magnetic field that pulls the armature and closes the contacts in the relay. Just because there is current and a magnetic field does not necessarily mean the contacts were closed or that if they were, they are good undamaged clean contacts. Here is a better way to determine if your merge relay is working.
Get you digital voltmeter and check the voltage across the two big terminals with the merge relay on ( your normal configuration ). A very low voltage in the range of .1V or less is good. Then turn the merge relayy off ( your dry camping position ) and allow some time to pass - a few hours. Then again measure the voltage across the big terminals with your DC meter and it should be considerably higher than it was before, indicating the contacts have opened and you are seeing the difference between your chassis and house batteries.
Let us know what you find.
Russ
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