Start Relay - Mercury V6 175 Diagnostic Manual

Actuators and Relays
c
b
H
a
A
4 1
V8 DTS model shown, others similar
a - PCM connector A
b - Main power relay (MPR)
c - Hot stud (battery +)
d - Fuse block
Connector
30
86
85
87
59637
A C
65699

Start Relay

The start relay is controlled directly by the engine PCM. When the PCM receives a start request, it sends a ground to the start
relay. The relay closes and sends power to the starter solenoid to crank the engine. Once the PCM determines that the engine
has started, it removes the ground from the start relay and the starter motor stops cranking.
Page 5B-6
RED
RED
30
109B
85 RED
86
87
RED/WHT
A1
A2
H4
Pin Wire Color
30 Red
85 Red
86 Yellow/purple
87 Red/white
A1 Red
A2 Red/pink
A3 Red/white
A4 Orange/white
A5 Red/white
A6 Red/yellow
1
B1 Red/white
B2 Red/orange
B3 Red
B4 Red/purple
B5 N/A
B6 N/A
6
C1 Red/white
C2 Red/orange
C3 Red/white
C4 Orange/gray V8 only; fused (5 A) 12 V power (+) ‑ advanced sound control
C5 Red/white
C6 Red/blue
© 2018 Mercury Marine
RED/WHT
ORN/WHT
RED/WHT
RED/YEL
105B 105C
RED/WHT
RED/ORN
105A
RED/WHT
RED/ORN
RED/WHT
ORN/GRA
RED/WHT
RED/BLU
Function
12 V battery power (+)
12 V battery power (+)
Main power relay (MPR) control signal
Switched 12 V power (+)
Not shown
Not shown
Switched 12 V power (+)
Fused (10 A) 12 V power (+) ‑ O2 sensor
Switched 12 V power (+)
Fused (20 A) 12 V power (+) ‑ ignition coils
Switched 12 V power (+)
Fused (2 A) 12 V power (+) ‑ RS48 diagnostic
DTS only; not shown
DTS only; not shown
Not used
Not used
Switched 12 V power (+)
Fused (2 A) 12 V power (+) ‑ fuel injectors
V8 only; switched 12 V power (+)
Switched 12 V power (+)
Fused (20 A) 12 V power (+) ‑ driver power
A1
A2
A3
A4
A5
A6
B1
B2
d
B3
B4
B5
B6
C1
C2
C3
C4
C5
C6
65946
90-8M0146617 eng JULY 2018
PCM
–
–
AA2
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
CG3, CG4