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My ABS wouldn't self check either. I think it detects low voltage and just throws the light. My PCB would appear to work fine sometimes, as in letting you crank the truck, but apparently would stop charging sometimes while the truck was running. This led to the batteries eventually draining...

If it happens again and the gauges don't work, turn the fan on to high and see if it works. The high setting is 24v and runs through the PCB and the low setting is 12v and doesn't run through the PCB. If it doesn't work on high but does work on low and your gauges are not working then I'd be...

Glad to hear you got it going. Still curious whether the gauges were working when it was dead. This will tell you if it was the neutral safety switch causing the problem or something else.

Do your gauges work when you turn on the battery switch? Your voltage gauge should read and the fuel gauge should show the current fuel level with the battery switch on, even with the truck not running. If they don't, then I'd verify the PCB is working correctly after checking the other things...