Description Nm lb‑in. lb‑ft
Nut 7 62 –
4. Check the alternator drive belt for excessive wear, cracks, glazed surfaces, and fraying. Replace if necessary.
Charging System Circuitry Tests
Perform the following tests with a DMT 2004 digital multimeter, to ensure that all of the circuits between the alternator and the
other components within the charging system are in good condition.
DMT 2004 Digital Multimeter
91‑892647A01
Output Circuit
1. Connect the DMT positive (+) lead to the battery positive (+) post.
2. Connect the DMT negative (–) lead to the battery negative (–) post.
3. Supply cooling water to the engine.
4. Start the engine and increase engine speed to approximately 1300 RPM.
5. Observe the voltage reading.
a. If the reading is below 13.5 volts:
i. Connect the positive (+) DMT lead to the alternator output post.
ii. Connect the negative (–) DMT lead to the ground post on the alternator.
a - Alternator output post
b - Alternator ground post
A
C
O
M
m
A
V
H
z
mV
V
H
z
TEMP
m
A
A
IG
IP
OFF
H
z
TEMP
13.95
b
a
66370
Charging and Starting System
90-8M0146617 eng JULY 2018 © 2018 Mercury Marine Page 6B-7
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