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55, The Frankster was also interested in the advantages of the 4 pole VR sometime back and I never really read much more on them. For sure a couple advantages are alllll lllll the gennys output DOES NOT have to flow through the cutout relay portion of the VR (less wear n tear n current through it) on the 4 pole as a lot of it goes directly to the L (Load) terminal instead to feed lights n ignition directly i.e. that current out the L terminal pumps x amount of current direct from the genny to the loads and DOES NOT have to first pass through the cutout relays contacts. A second advantage related to that is less chances of overcharging the battery since some of the current which would otherwise go to the battery is being used where its actually needed. Although even a 3 pole VR regulates current to charge the battery at the correct level, the 4 pole does a lil more precise n better job in my (not deep researched) opinion.. Your second question about VR measurements when its just sittin there disconencted: The VR's terminals ohm measurements with respect to the case/frame would be something like: (The ones I know at least) The FLD terminal would be near 0 ohms since it (field current control relay) should be in the basic High Charge mode trying to dead ground the field windings for max current n max charge since its not yet sensing any genny output voltage..... ..... The BAT terminal should be like an open circuit (extremeeeee high ohms) since its always connected to the battery when setting there not running and the cutout relays NOT closed (dont till gennys output voltage on ARM terminal is higher then battery voltage) cuz otherwise the battery would discharge..... . HOWEVER I dont have any measurements or specs or data of the GEN (or ARM) terminal ohms with respect to the case/frame when sittin there not connected. Im gonna post that question for discussion with Bob or Bob M over on the "dark side" n see if they have any data. I can give ya my "best guess" It would be whatever resistance the small wire shunt winding portion of the cutout relay is and thats wayyyyy y more then the big wire series portion of the cutout relay, maybe ohhhhh hhh 15 to 50 ohms????? Maybe Bob or Bob M or Glen or the Frankster or others have data concerning the GEN/ARM terminal ohms with respect to ground, so I will just GUESS 15 to 50 ohms for now??? John T
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