1990 Yamaha G5-EF "SUN CLASSIC" (36V - DC MOTOR) Service ...
Diagnosis on an electric Sun Classic starts with the correct wiring diagram, and for the 1990 G5-EF, code G5EF, that diagram is in Yamaha manual LIT-11616-07-10.
The book covers 1990 to 1995 and both drive types in the G5 range, so the carbureted cars and the later G5-EG and G5-EH electric variants share its pages with this one.
For the DC-motor car the useful chapters deal with the motor itself, the control circuit, the contactors and the charging arrangement, each tested in the order Yamaha specified rather than by swapping parts. Brake, steering, suspension and axle work is covered to the same standard, with removal sequence, inspection figures and torque values given in place. Confirm the code G5EF on the car and this is the reference written for it.