Abnormal Ammeter Operation; Switch On, Negative (-) On Ammeter, Engine Running; Abnormal Charging System Operation - Dodge D250 1990 Service Manual

Electrical System
DODGE Turbo Diesel
Diagnosing Electrical Malfunctions
Page 8-9
Trouble with the charging system may be indicated by the U ^ M
ammeter. \ — /
Abnormal Ammeter Operation
Check the ammeter for normal operation as shown below.
Engine Switch Ammeter
Stopped Off o
Stopped On
Running On +
Switch On, Negative (-) on Ammeter, Engine
6£\
Running.
If the ammeter is indicating a discharge during engine
operation, inspect the alternator drive pulley and drive belt for
slippage.
Abnormal Charging System Operation
Check the battery and all wiring connections.
Inspect the wiring for defects. Check all connections for
tightness and cleanliness, including the slip connectors and
connections at the battery.