Dodge ram truck 3500 1996 Service Manual page 450

8F - 6 AUDIO SYSTEMS
DIAGNOSIS AND TESTING (Continued!
(3) There should be no continuity. I f continuity Is
found, replace the faulty or damaged antenna base
and cable assembly.
TEST 2
Test 2 checks the antenna for an open circuit as
follows:
(1) Disconnect the antenna cable lead from the
radio chassis.
(2) Connect one ohmmeter test lead to the tip of
the antenna mast. Connect the remaining lead to the
tip of the antenna cable lead (the part inserted into
the radio).
(3) Continuity should exist (the ohmmeter should
only register a fraction of an ohm). High or infinite
resistance indicates damage to the base and cable
assembly. Replace the faulty base and cable, i f
required.
TEST 3
Test 3 checks the condition of the vehicle body
ground connection. This test should be performed
with the battery positive cable removed from the bat­
tery. Disconnect both battery cables, the negative
cable first. Reconnect the negative cable and perform
the test as follows:
(1) Connect one ohmmeter test lead to the vehicle
fender and the other lead to the battery negative
post.
(2) The resistance should be less than one ohm.
(3) I f the resistance is more than one ohm, check
the braided ground strap connected to the engine and
the vehicle body for being loose, corroded, or dam­
aged. Repair the ground strap connection, if required.
TEST 4
Test 4 checks the condition of the ground between
the antenna base and the vehicle body as follows:
(1) Connect one ohmmeter test lead to the fender
and the other lead to the crimp on the coaxial
antenna cable shield.
(2) The resistance should be less then one ohm.
(3) I f the resistance is more then one ohm, clean
and/or tighten antenna base to fender mounting
hardware.
RADIO FREQUENCY INTERFERENCE
Inspect the ground connections at the following:
• Blower motor
• Electric fuel pump
• Generator
• Ignition module
• Wiper motor
• Antenna coaxial ground
• Radio ground
• Body-to-engine braided ground strap (if equipped).
Clean, tighten or repair the connections as
required.
Also inspect the following secondary ignition sys­
tem components:
• Spark plug wire routing and condition
• Distributor cap and rotor
• Ignition coil
• Spark plugs.
Reroute the spark plug wires or replace the faulty
components as required.
R E M O V A L A N D I N S T A L L A T I O N
RADIO
(1) Disconnect and isolate the battery negative
cable.
(2) Open the cup holder and remove the two
screws securing the assembly to the instrument
panel (Fig. 2). Remove the cup holder assembly from
the instrument panel.
Fig. 2 Cup Holder Remove/Install
(3) Remove the ash receiver. Remove the two
screws securing the ash receiver bracket to the
instrument panel (Fig. 3). Remove the ash receiver
bracket assembly from the instrument panel.
. J948E-9
Fig. 3 Ash Receiver Remove/Install
i