The 4-terminal setup effectively removes the load wiring between the VR's BAT terminal and the ammeter. This takes load current and it's associated voltage loss out of that piece of wiring (actual wire length/voltage drop depends on the VR's location).
This results slightly less voltage drop between the ungrounded battery terminal and the VR when the lights are burning. Ie. the VR senses voltage at the battery a bit more accurately and thus does a better job of charge control when the lights are on.
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We're contemplating a visit to Red Power this year. A joint sparky seminar there might be kinda fun - unless we get lightning/rain/wind like you did at the Canandaigua Expo that is!
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Today's Featured Article - Tractor Profile: Earthmaster - by Staff. This tractor, manufactured by the Earthmaster Farm Equipment company in Burbank, California was made for only two years. The Model C came out in 1948 and was followed by the "CN" (narrow-width model), "CNH (narrow-width high-crop model), "CH" (high-crop), "D" and the "DH" (high-crop) in 1949. The main difference between the models was tire size, tractor width and cultivating height. The "D" series were about 20 inches wider overall than the
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1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
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