Mercury 520 Bravo Sterndrive - Propeller Selection; Conditions that Lower Engine Performance

Four fuses protect the main power, fuel pump, ignition, and accessory circuits.
Four 10‑amp fuses protect the O
2
sensors. These are located near the 14‑pin
harness connector.
a - Good fuse
b - Bad fuse
c - Alternator and fuel pump circuit—20‑amp fuse
d - Power to 14‑pin helm harness—20‑amp fuse
e - ECM driver power, fuel pump relay, coils, and start relay (DTS—
20‑amp fuse
f - Trim down relay (DTS), trim up relay, and injectors circuit—20‑amp
fuse
g - Spare fuse
a
b
20
20
20
20
c
d
g
f
20
50401
e
OPERATION
eng 35