Honda BF115A, BF130A Outboard Motors Shop Manual., Page 141Get this manual
From P5-54
TEST HARNESS
1)Connect the test harness 34P connector to the ECM2) Connect the two 4P connectors to the main relay3) Turn the ignition switch ON4) Measure the voltage between the test box's A9, A17 terminals and the A25, A34 terminals respectively
Is there the battery voltage?
Repair open the YIBI wire between the ECM and the main relayReplace the main relay (P17-5)