4 is great. Four tubes, called full-wave rectification, the generator has high power utilization and fast charging speed.
With a tube, the generator only charges half the electricity, which is inefficient and slow. The voltage pulsation of a single tube is large, and the charging voltage fluctuates, which will affect the battery life.
In addition, when the reverse voltage diode of the single-tube half-wave rectifier is not conducting, there will always be a small reverse current passing through it, which is equivalent to adding a small current back pressure au battery Likewise, affects battery life and shortens the lifespan.
(1) Example of JF1522 six-tube alternator (for Dongfeng engine).
(2) Eight-tube alternator, example JFZ1542 (for Tianjin Xiali Automobile).
(3) Example of nine-tube alternator (used in Japanese automobiles Hitachi, Mitsubishi andMazda).
(4) Eleven-tube alternator, for example JFZ1913Z (for Audi and Santana cars).