Dodge RAM TRUCK 1500 1995 Service Manual page 353

8A - 2 0 BITTEiY/STARTiiG/CHARGili SYSTEMS DIAGNOSTICS
BR
(5) Connect a 0-150 ampere scale DC ammeter
(Fig. 22). Install in series between generator battery
output terminal and disconnected generator output
wire. Connect positive lead to generator battery out­
put terminal and negative lead to disconnected gen­
erator output wire.
(6) Connect positive lead of a test voltmeter (range
0-18 volts minimum) to disconnected generator out­
put wire. Connect negative lead of test voltmeter to
battery positive cable at positive post.
(7) Connect one end of a jumper wire to ground
and with other end probe green K20 field wire at
back of generator (Fig. 22). This will generate a DTC.
CAUTION: Do not connect green/orange A142 field
wire to ground. Refer to Group 8 W - Wiring Dia­
grams for more information.
(8) Connect an engine tachometer, then connect
battery negative cable to battery.
(9) Connect a variable carbon pile rheostat be­
tween battery terminals. Be sure carbon pile is in
OPEN or OFF position before connecting leads. See
Load Test in this group for instructions.
TEST
(1) Start engine. Immediately after starting, re­
duce engine speed to idle.
(2) Adjust engine speed and carbon pile to main­
tain 20 amperes flowing in circuit. Observe voltmeter
reading. Voltmeter reading should not exceed 0.5
volts.
RESULTS
If a higher voltage drop is indicated, inspect, clean
and tighten all connections. This includes any con­
nection between generator battery output terminal
and battery positive post. A voltage drop test may be
performed at each connection to locate the connection
with excessive resistance. If resistance tests satisfac­
torily, reduce engine speed, turn OFF carbon pile and
turn OFF ignition switch.
(1) Disconnect negative cable from battery.
(2) Remove test ammeter, voltmeter, carbon pile,
and tachometer.
(3) Remove jumper wire.
(4) Connect generator output wire to generator
battery output terminal. Tighten nut to 8.5±1.5 N-m
(75±15 in. lbs.).
(5) Connect negative cable to battery.
(6) Use DRB scan tool to erase DTC.
CURRENT OUTPUT TEST
The generator current output test determines
whether generator can deliver its rated current out­
put.
F I E L D
T E R M I N A L S
0 AMP F U S E
G R O U N D
Fig. 22 Generator Output Wire Resistance Test - Typical