NS Field short

I am a long time Ample Power customer. I am running your Lifeline NS, Emon II & autoswitch ( w/ an Amptech L160) in my camper which we live in full-time. It has been pretty much flawless for a decade until the other day. My charging system has died and I'm dead on the side of the road in NM and need help. I've alternating red & green leds flashing. My NS B+ 15A fuse keeps blowing ( The ignition on/off and BAT V seem fine) and I'm not sure if the problem is in the NS or the alternator but most likely something to do w/ the field shorting to grd. Is there a way to check to see if the NS is fine ? Can I turn on the ignition and measure the voltage between the Field & field return pins ( wires to alternator disconnected) without doing any damage. Will the NS go through a standard a standard boot procedure (solid red light for 5 s to flashing green etc) if it is not connected to the alternator ?
If necessary, how long to get a NS2 sent out if I want the BC & serial port options ?
If necessary, how long to get a NS2 sent out if I want the BC & serial port options ?