1999 "EE" 90, 115 FFI, 150, 175 V4, V6 FFI Outboards Service Manual, P/N 787024, Page 88Get this manual
Low or no voltage on anysubstitute known good coil and recheck primary voltage- If voltage is now OK, coil was defectiveReplace and verify repair- Still low or no voltage on somereplace ECUVerify repair No voltage on allgo to Step 5Step 5: Voltage Supply TestsThe battery must be fully charged, ith all connections clean and tight AVerify emergency stop clip is in place
BCheck condition of fuses in Positions and 7
INote Perform the following tests while problem is occurring[] CVerify switched B+ is present at purplewhite wire, terminal "J", of Power Distribution Panel 14-pin connectorCheck should show either 9.5 or more volts while cranking, or 13 or more volts while running OKgo to Step No voltage or low voltage while runningtest Stop CircuitSee Step Low voltage while cranking:Verify battery capacity, condition, and connectionsTest voltage drop across battery cables and starter solenoid