Quoted from PinJim:
What’s the driver transistor? If it’s a TIP102, you should be able to ground the metal tab to see if it’s possibly an issue with the transistor itself. Or just ground the wire at the coil, if you know which side to ground...
I suppose a cold solder joint could be at play, restricting current flow? Or a partially failed transistor. Or some added coil resistance? All seem unlikely, but I suppose anything is possible.
I've taken a oscilloscope shoot (above), and the transistor does switch. What I don't know however is the current draw, that was going to be my next step (need a current probe for my scope), and the reason why I was asking for the reference ohm resistance of the coil, if anyone has it. Should be around 3.5/3.7 ohms.