Vintage 6-Volt Generator Cut-Out & Ammeter Charging Circuit Diagram (Fig. 4)

This is a scanned page from a vintage automotive reference book showing Fig. 4, a schematic wiring diagram of a generator charging circuit with the cut-out points (P) closed. The diagram illustrates a shunt-field generator (with commutator "COM.", B+ and -G terminals, and shunt field windings labeled SHF) connected through a cut-out relay (with series winding S, voltage winding V, contact points P, spring SP, and armature A, grounded at G1) to an ammeter and a 3-cell 6-volt battery (grounded at G2). The ammeter face reads "DISCHARGE / CHARGE" with a 30-0-30 scale, and the caption notes the needle shows "charge" because current from the generator is flowing through the ammeter to the battery. The caption explains that 10 to 15 amperes is usually the highest charging rate when the generator runs at 1,000 rpm or more, that 22 amperes is the extreme limit to which a generator can be adjusted, and that some generators are limited to 15 or 16 amperes. A reader learns how the cut-out connects the generator to the battery, how charging current registers on the ammeter, and typical/maximum generator charging rates for early 6-volt automotive electrical systems.