Installation STEP 2 - Install Battery Switch and Engine Breaker. Install the battery switch for the engine. Then, close to the battery switch, install a 50 amp circuit breaker (use an 80 Amp breaker when glow plugs are specified). The circuit breaker will need to be located so the 2.5 meter (8 foot) cable supplied on the engine can reach the breaker. Do not extend this cable. The wire from the battery switch to the circuit breaker should not be longer than one meter (3 feet). The wire size should be 10mm 2 (AWG 6). The wire size of the main ground cable and the cable to the starter motor should be sized based on their length.
When determining the wire size add the length of the negative cable from the engine block to the battery and the length of the positive cable from the starter to the battery together. Distance Wire size Up to 5 meters (16 feet) 20mm 2 AWG 4 Up to 9 meters (30 feet) 40mm 2 AWG 1 Breaker Wiring Diagram Note: See page 14 for the detailed power wiring diagram. Electronic Control System: Single Engine Installation Manual for BY Series Engines with Unlimited Controls © Yanmar 2008 Page