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thin wire is ok to check the valve. bell wire is ok for that. you only need heavy wire to carry heavier current loads.
if you pull that rubber boot back on the wire there might be a place you can solder to where the wires connect to the terminals. If you solder some test leads on you can always just clip them off or short and tape up later. If you dont want to delve into the schematic try hooking your meter between negative battery post and either terminal and the one that reads 12 V is hot. the meter shoudl tell you if this is a constant hot or if the voltage is varied somehow.
you can disconnect the batttery and hook your meter from negative to either lead and if one reads o ohms or near that it is probably grounded. keep in mind things can be turned on or off by switching the ground or the hot and the DME may be switching the ground, Im not sure which way its wired.
if you connected a small light bulb , like one used in the dash or similar you might be able to see when the light is on and off when it's running, that visual may help understand better about when it has power and when it does not. you can do similar with a meter if preferred.
i suspect the thing has a coil of wire inside it that acts as an electromagnet so when power is applied it pulls one way. if the polarity is reversed to the coil then it would still energize the coil. you could also check between the two with a meter and read the resistance of the coil. you can compare to others. your meter can tell if it's open ( broken wire) or shorted, I think you can expect some resistance, exactly what , not sure but it would not be zero ohms or oen line but somewhere between. in other words some amount of resistance. I can't say offhand, it might be 100 to 2000 ohms, just a guess.. if you have a spare to compare to you can expect that to be similar.
I think from what is said it's either open or closed and not open part way based on voltage but could be wrong.. some might have 3 wires at that connector.. If you can check with a meter then youd see either a varying voltage or simply 12 V being switched in or out.
Id be careful about feeding power to the Wires or grounding them, You don't want to blow your ECU by doing something weird lie backfeeding wires from your battery..
I noticed in clark's it says you can feed in 10 PSI to look for a leak, I guess one might inflate a baloon and connect that, and if the balloon is full of smoke that might work as a poor man's smoke injector. Ive heard of vape pens used.
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