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V8 DTS model shown, others similar

a - PCM connector A

b - Main power relay (MPR)

c - Hot stud (battery +)

d - Fuse block

Connector Pin Wire Color Function PCM

59637

30 Red 12 V battery power (+) –

85 Red 12 V battery power (+) –

86 Yellow/purple Main power relay (MPR) control signal AA2

87 Red/white Switched 12 V power (+) –

65699

A1 Red Not shown –

A2 Red/pink Not shown –

A3 Red/white Switched 12 V power (+) –

A4 Orange/white Fused (10 A) 12 V power (+) ‑ O2 sensor –

A5 Red/white Switched 12 V power (+) –

A6 Red/yellow Fused (20 A) 12 V power (+) ‑ ignition coils –

B1 Red/white Switched 12 V power (+) –

B2 Red/orange Fused (2 A) 12 V power (+) ‑ RS48 diagnostic –

B3 Red DTS only; not shown –

B4 Red/purple DTS only; not shown –

B5 N/A Not used –

B6 N/A Not used –

C1 Red/white Switched 12 V power (+) –

C2 Red/orange Fused (2 A) 12 V power (+) ‑ fuel injectors –

C3 Red/white V8 only; switched 12 V power (+) –

C4 Orange/gray V8 only; fused (5 A) 12 V power (+) ‑ advanced sound control –

C5 Red/white Switched 12 V power (+) –

C6 Red/blue Fused (20 A) 12 V power (+) ‑ driver power CG3, CG4

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.

105C

105B

109B

105A

RED/WHT

RED

YEL/PPL

RED/WHT

ORN/GRA

RED/WHT

RED/ORN

RED/BLU

RED/ORN

RED/YEL

ORN/WHT

10A 2A

20A 5A 20A

20A

8685

B6 B5

C5 C4 C3 C2

A6 A5 A4 A3 A2 A1

65946

Actuators and Relays

Brand	Mercury
Model	V8 250
Category	Outboard Motor
Language	English

Mercury V8 250 User Manual

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Mercury V8 250 Specifications

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