Mercury Optimax Models 135, 150, Direct Fuel Injection., Page 317Get this manual
POWER TRIM
ELECTRICAL SYSTEM TROUBLESHOOTING
CONDITION OF TRIM SYSTEM ATrim motor does not run when trim button is depressedBTrim system trims opposite of buttonsCCowl mounted trim buttons do not activate trim systemPROBLEM 1, 2, 4, 5, 6, 7, 2, 4, 5, 6, 7
PROBLEM
1Battery low or discharged2Open circuit in trim wiring3Wiring reversed in remote control4Wire harness corroded through5Internal motor problem (brushes, shorted armature)6Blown fuse(s)7Trim switch failure8Verify relays are functioning correctly