Dear John, with all due respect (Im here to help NOT argue) and only to help clarify things a bit. You say "check it with it hooked up to the generator YOU MAY NOT GET A READING even if there is voltage there because it will be going thru the generator to the frame/ground thus using up all the voltage."
With specific regard to "you may not get a reading even if voltage is there"
Its my professional (albeit a tad rusty lol) opinion
If voltage IS THERE (on ARM terminal if its wired to gennys ARM post) due to the cutout relay closed (connects BAT to GEN/ARM), you WOULD GET A READING of approximately battery voltage with respect to frame ground. The BAT terminal is wired to the battery perhaps via a series ammeter, and if the relay is closed BAT is connected to GEN/ARM, SO YOU "WOULD GET" A READING APPROXIMATELY WHAT THE BATTERY VOLTAGE IS
With regards to your statement "using up all the voltage?"
It is my professional opinion
"Indeed, the battery voltage will be dropped mostly ACROSS the generator if its in the series circuit from battery due to a closed cutout relay. THERE WOULD BE BATTERY VOLTS ON THE GEN/ARM TERMINAL IF THE RELAY IS CLOSED and its all dropped (you call used up) across the Generator, thereby you end up at zero volts on the gennys grounded brush output which is connected to frame ground. Its all got dropped (used up) across the load which is the generator. BUT THERE IS A READING AND ITS APPROXIMATE BATTERY VOLTS AT THE START, WHICH IS THE GEN/ARM POST if the cutout relay is closed (then gets dropped across the genny)
SOOOOOOOOOOO what I'm saying is that if the VR or Cutout Relay is in place and all wired correct and the Cutout Relay is stuck closed:
You WOULD GET VOLTAGE (with respect to frame) on the GEN/ARM terminal since its essentially connected to the battery via the ammeter and closed cutout relay
Most all that voltage gets dropped (you call used up) across the Generator but at the starting point GEN/ARM terminal its there since that's basically connected to the ungrounded battery post via an ammeter and a stuck closed cutout relay (it connects BAT to GEN/ARM if closed)
Hope this helps and again Im NOT here to argue but only help with all due respect.
John T Too long retired EE and rusty so no warranty but I still believe Kirchoffs laws and voltage drop principles apply?? But Ive been wrong manyyyyyyyyyy times before lol
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