Starting System Electrical Diagrams; Starter Solenoid Circuit; Starter Motor Circuit - Mercury MerCruiser Service Manual

Starting System

Starting System Electrical Diagrams

Starter Solenoid Circuit

For parts identification and further information, refer to the PCM 112 Service Manual.
(+)
(–)
Refer to the diagram above. Once the starter relay is engaged, the current needed to engage the solenoid mounted on the
starter motor flows:
1. From the battery positive (+) post to the engine‑mounted hot stud (red battery cable)
2. From the hot stud through the 90‑amp fuse located on the hot stud
3. From the 90‑amp fuse to the 50‑amp circuit breaker (red)
4. Through the circuit breaker, through a splice, and to the starter relay terminal 30 (red/purple)
5. Across the closed relay contact to terminal 87
6. From terminal 87 to the "S" connector on the starter‑mounted solenoid (yellow/red)
7. From the solenoid "S" connector across the starter solenoid coil
NOTE: When the starter solenoid coil is energized, it closes contacts that allow current to flow to the starter motor. Refer to

Starter Motor Circuit

8. From the solenoid coil, through the starter mounting bolts to the engine ground
9. From the engine ground to the negative (–) post of the battery (black battery cable)
Starter Motor Circuit
Refer to the diagram above. Once the starter‑mounted solenoid is engaged, the high current needed to run the starter motor
flows:
1. From the battery positive (+) post to the engine‑mounted hot stud (red battery cable)
2. From the hot stud to the starter‑mounted solenoid (red battery cable)
Page 4A-6
RED
BLK
for details.
RED
BLK
© 2016 Mercury Marine
S103
RED/PPL
RED
YEL/RED
56785
90-8M0099748 eng DECEMBER 2015
30 87
56787