3. The DMT should indicate battery voltage. If battery voltage is not present, check the purple lead for a loose or dirty
connection or damaged wiring.
a - Excitation circuit purple lead
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
12.75
a
b
66377
Charging and Starting System
90-8M0146617 eng JULY 2018 © 2018 Mercury Marine Page 6B-9
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