Hey bud, hoping you could verify if this sounds like a good reading or indicative of a problem. I'm not getting half bat at T2, on the main SCR, which I think is causing a failure to actuate contacts for the drive unit, So I wanted to see what was the cause. I stripped down the SCR, applied 5.9 v to the anode, and the meter pos, and the negative of the 5.9 battery voltage to the cathode along with the meter. Voltage difference was 5.9. Then I jumped the anode to the gate, and the SCR closed, conducting from anode to cathode, but there was enough resistance in it that I saw a 1.2 V difference between the anode and cathode.

Since the circuit at that point is literally bat pos, anode, cathode, bat neg, it makes sense to me that the SCR would represent significant R value for the total circuit and constitute a voltage drop of that value, but I'm smart enough to not rely on my intuition yet. The gate control caused the SCR to latch, and I maintained the volts after removing the jumper, restarted conduction instantly each time. Seems like a good SCR to me, but maybe I'm missing something? Open Ohms was something like 20-30 mega ohms and then the voltage from the multi meter somehow modified it, and it jumped up to infinite (as far as my Fluke 117 can manage to see)

I think anode to gate might have been teens or 20 ohms.

Does that all sound like a solid SCR, or am I totally missing something?