2007-2009 Yamaha F15/F20 Outboard Service Manual, Page 262Get this manual
Engine electric control systemCharging system (electric starter model)
Checking the Rectifier Regulator
CAUTION:
If the battery cables are connected in reverse, the Rectifier Regulator can be damaged1Measure the Rectifier Regulator output peak voltageCheck the Rectifier Regulator for continuity if the output peak voltage is below specificationG B
S6AG8260
NOTE: To prevent the engine from starting when cranking it, be sure to disconnect both spark plug caps Do not remove the clip from the engine stop lanyard switchLighting coil output peak voltage: Green (G) Green (G) rmin DC Unloaded Cranking 13.4 1,500 33.2 3,500 75.4