Dodge RAM TRUCK 1500 1995 Service Manual page 531

B R — 8W-01 GENERAL INFORMATION—WIRING DIAGRAMS — — — 8W - 01 - 5
- n r +
4
/ / /
+ -
6 o
948W-194
Fig. 8 Testing for Voltage
(3) Connect the other lead to the other end of the
circuit being tested. Low or no resistance means good
continuity.
F U S E R E M O V E D
F R O M C I R C U I T
+ -
C ( M ) ]
948W-195
Fig. 9 Testing for Continuity
TESTING FOR A SHORT TO GROUND
(1) Remove the fuse and disconnect all items in­
volved with the fuse.
(2) Connect a test light or a voltmeter across the
terminals of the fuse.
(3) Starting at the fuse block, wiggle the wiring
harness about six to eight inches apart and watch
the voltmeter/test lamp.
(4) If the voltmeter registers voltage or the test
lamp glows, there is a short to ground in that gen­
eral area of the wiring harness.
TESTING FOR A SHORT TO GROUND ON
FUSES POWERING SEVERAL LOADS
(1) Refer to the wiring diagrams and disconnect or
isolate all items on the fused circuit.
(2) Replace the blown fuse.
(3) Supply power to the fuse by turning ON the ig­
nition switch or re-connecting the battery.
(4) Start connecting the items in the fuse circuit
one at a time. When the fuse blows the circuit with
the short to ground has been isolated.
TESTING FOR A VOLTAGE DROP
(1) Connect the positive lead of the voltmeter to
the side of the circuit closest to the battery (Fig. 10).
(2) Connect the other lead of the voltmeter to the
other side of the switch or component.
(3) Operate the item.
(4) The voltmeter will show the difference in volt­
age between the two points.
r
JDL
+
948W-196
Fig. 10 Testing for Voltage Drop
TROUBLESHOOTING WIRING PROBLEMS
When troubleshooting wiring problems there are
six steps which can aid in the procedure. The steps
are listed and explained below. Always check for non-
factory items added to the vehicle before doing any
diagnosis. If the vehicle is equipped with these items,
disconnect them to verify these add-on items are not
the cause of the problem.