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any time you mess with relays … like a solenoid… the moment current drops…. the inner coil will try to maintain (hopelessly) the magnetic field it generated while it was energized..
In doing so the generated counter EMF will kickback much like an ignition coil fires a sparkplug.
Was it “thousands of volts” ??? hard to say but it never feels good. next time use insulated pliers !
from wiki…
the voltage appearing across an inductor or coil is due to a change in current which causes a change in the magnetic field within the coil, and therefore the self-induced voltage.<sup id=”cite_ref-Graf_1-1″ class=”reference”>[1]</sup><sup id=”cite_ref-2″ class=”reference”>[2]</sup> The polarity of the voltage at every moment opposes that of the change in applied voltage, to keep the current constant.<sup id=”cite_ref-Graf_1-2″ class=”reference”>[1]</sup><sup id=”cite_ref-3″ class=”reference”>[3]</sup>
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