To test a Lionel TMCC coil coupler without being connected to the controller board what voltage is used ans AC or DC (does it matter).
THanks
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12-18VAC should trigger the common coil couplers.
Depending on the coupler, it may require 14-15 VAC to trigger it. I've seen quite a few that buzz on 12 VAC, but won't open I figure as long as they work by the time they get to 15 VAC, I still consider them good. 
OK thanks, just wanted to make sure there were not in the 6V or so range and burn them up on a test. and obviously you just need a momentary pulse.
Yep, they'll get hot in a hurry if you leave them connected. The pulse from uncoupling is less than 1/2 second as a rule.
