1974 Johnson 135 HP Outboard Motors Service manual, Page 18Get this manual
2- 10 TROUBLE CHECK CHART (CONT) TROUBLE SHI FT WILL NOT OPERATE (Cont) POSSIBLE CAUSE
BLOWER UNITSee Section 6
Incorrect lubricant (OMC Sea-Lube Gearcase Lube only) Oil pump screen plugged Faulty adjustment Damaged shift assist cylinder Oil pump wornlow oil level Shifter dog or sprin damaged
7ALT ERNATOR WILL NOT OPERATE
(Weak or under charged battery)
AALTERNATOR SYSTEMSee Section 7
Faulty wiring Recti fier diodes damaged Shorted or open stator windings