Sensing And Excitation Circuits - Mercury MerCruiser Service Manual

Charging System
DMT 2004 Digital Multimeter
V H z
mV
OFF
A
7. Start the engine and operate at 1300‑1500 RPM. A DMT reading of more than 0.5 volts indicates excessive resistance in
the wiring.
8. Connect the DMT negative (–) lead to the alternator ground terminal. Connect the DMT positive (+) lead to the battery
negative (–) post.
9. Start the engine and operate at 1300–1500 RPM. A DMT reading of more than 0.5 volts indicates excessive resistance in
the wiring.

Sensing and Excitation Circuits

Perform the following tests to ensure that all of the circuits between the alternator and the other components within the charging
system are in good condition.
1. Unplug the purple and red/pink connector from the alternator.
2. Connect the positive (+) digital multi‑tester (DMT) lead to the red/pink lead and the negative (–) DMT lead to the ground
terminal.
DMT 2004 Digital Multimeter
Page 4C-12
H z TEMP
m A
A
IG
IP
TEMP
m A
C O M V H z
© 2016 Mercury Marine
DMT connections
H z TEMP
m A
A
V
H z
mV
IG
OFF
IP
TEMP
A m A C O M V H z
DMT connections
91‑892647A01
29366
29368
91‑892647A01
90-8M0099748 eng DECEMBER 2015