Trim Up/Out Switch Inoperative In Manual Trim Control; Trailer Switch In Manual, Trim Control Inoperative; Boat Is On Plane Well Before Drive Unit Begins To Trim Out; Boat Is Not On Plane Before Drive Unit Begins To Trim Out - Mercury BRAVO Service Manual

SERVICE MANUAL NUMBER 28

Trim UP/OUT Switch Inoperative In Manual Trim Control

TRIM DOWN/IN SWITCH FUNCTIONS, AUTO MODE FUNCTIONS PROPERLY
Trim 20 amp fuse "43" blown (if
equipped).
Open in power supply lead to trim and
trailer switch.
Faulty trim UP/OUT switch (applies
only to trim controls where it is
necessary to actuate trim UP switch in
order for trailer switch to function).

Trailer Switch In Manual, Trim Control Inoperative

TRIM UP/OUT SWITCH FUNCTIONS
Faulty trailer switch.
Opening in wiring.

Boat Is On Plane Well Before Drive Unit Begins To Trim Out

Control module adjustment incorrect.
Faulty control module.

Boat Is Not On Plane Before Drive Unit Begins To Trim Out

Control module adjustment incorrect.
Faulty control module.
90-863160 MAY 2000
Cause
Cause
Cause
Cause
Special Instructions
Determine cause for blown fuse and
correct before replacing fuse.
Check voltage at terminal 44. If no
voltage is indicated, check lead
for a poor connection or damage.
Check for voltage at terminal
while actuating trim UP/OUT switch.
Replace switch if no voltage is
indicated.
Special Instructions
Check for voltage at terminal
42 while actuating trailer switch. If
voltage exists at terminal 42, but not
at terminal 41, a faulty switch is
indicated. If no voltage exists at
terminal 42, check power supply lead
for an opening.
Check lead 39 for damage or a
loosened or corroded connection.
Special Instructions
Adjust. (Refer to SECTION 5)
Replace control module.
Special Instructions
Adjust. (Refer to SECTION 5)
Replace control module.
TROUBLESHOOTING
45
40
41 and
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