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Dieseljeep says above that it is a test point for the heater string and not meant ot be connected...He knows his stuff so I'm inclined to agree with him.
BTW unless you connect something to the end of that wire there is no "current" in it....You have to have a closed/complete circuit for current to flow (or an arc from the end of the wire to someplace). Voltage is the potential for current to flow, current is the flow and resistance is the restriction of the flow rate.
Use an air compressor tank as an analogy (assume tank is the positive terminal and the atmosphere is negative of a battery) if the tank valve is closed you have pressure (voltage), but no flow (current), is you open the valve half way you still have voltage but also now have flow (current), the restriction of the valve represents resistance to equalization of pressure/limit of current flow.
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