Mgb Alternator Wiring Diagram. Test the system to be sure it is charging and drive it away. Since we are mainly concerned with battery health off charge and alternator output does it matter what the drop is to the green circuit so long as we have an intelligent observor.
Then at the control box move the fat charging wire from the d terminal to the a terminal and move the small signal wire from the f terminal to the d terminal. A single trick that i 2 to printing exactly the same wiring plan off twice. If not there is a problem with the alternator.
1 m418g or 2m100 ghn3 ghd3 3 synchromesh cars.
Diagram 17 7374 mgb from bentley 3nb067 sheet 17 batt overdrive on off switch transmission interlock switch overdrive solenoid w alternator ind ny alternator warning lamp w ignition switch radio connection w w2 c1 starter relay n w w ulg g g rlg rlg nlg nlg 2 1 n wiper motor ulg wr n wiperwasher switch yp w 3 5 yr fuel pump w wg y y washer motor wlg n n b lgb wb. This is the wiring diagram for a typical alternator. The voltage should be the same on each reading and the volt meter should show 125 to 130 volts. However if you do some tracing you will discover that one of the yellow brown wires runs up into the harness and doubles back giving the appearance that there are two wires.