Mercury 15 EFI FourStroke, Service Manual

Page: 86 / 406

Ignition System Wiring Diagram
a - ECM
b - Ignition coil
c - Stator (white and yellow wires are not part of the ignition circuit)
d - Ground
Stator Resistance Test
IMPORTANT: Perform this test with the engine not running.
NOTE: Readings may vary slightly due to temperature changes. The test readings listed were taken at 20 °C (68 °F).
1. Ensure that the engine is not running, and disconnect the stator harness connectors.
2. Use the DMT 2004 Digital Multimeter to perform the following measurements. If the stator coil measurements are not within
10% of the values listed, replace the stator.
WHT
YEL
BLU
BLK/RED
33963
DMT 2004 Digital Multimeter 91‑892647A01
Circuit
Meter Test Leads
Meter Scale Reading
Red Black
Ignition winding Blue Black/red Ω 1.04–1.56 Ω
Battery charge winding Yellow White Ω 0.17–0.25 Ω
Stator Removal
1. Remove the air box and recoil starter.
• It is easiest to remove and install these two items together.
• Refer to
Section 3C
‑
Air Box Removal
and
Section 8A
‑
Recoil Starter
.
2. Remove the flywheel. Refer to
Flywheel Removal
.
3. Electric start models: Disconnect the white and yellow stator wires (bullet connectors) from the voltage regulator/rectifier.
4. Disconnect the blue and black/red stator wires (bullet connectors) from the engine harness.
ORN
BLK/RED
BLU
BLK
BLK
ORN
BLK
J4
BLK/RED
BLU
BLK/RED
BLU
WHT
YEL
62886
1
3
5
10
1 18
17 34
17
1
10
3
2
4
5
6
7
13
15
12
11
14
16
9
8
34
18
27
20
19
21
22
23
24
30
32
29
28
31
33
26
25
a
b
c
d
Ignition
90-8M0125265 eng NOVEMBER 2017 © 2018 Mercury Marine Page 2A-15