ELECTRICAL GENERAL MAINTENANCE INSTRUCTIONS - CONTINUED
RELAY INSPECTION AND TEST
Check for bent or damaged pins.
Check for burned or damaged relay case.
N OT E
When testing relays, always refer to the circuit diagram printed or stamped on relay case.
Using a multimeter, check for continuity across relay coil.
Using a multimeter, check open or closed contacts within relay.
JUNCTION BLOCK INSPECTION
Check for corrosion in fuse and relay holders.
Check for cracks or damage to junction block body.
Ensure that connectors are tight and free of corrosion.
Using a multimeter, check for good continuity across buss bars and connectors. Refer to Electrical Schematics
ELECTRICAL CONNECTORS INSPECTION (ENGINE)
System Operation Description:
Most electrical problems are caused by poor connections. The following procedure will assist in detecting problems
with connectors and with wiring. If a problem is found, correct the condition and verify the problem is resolved.
Intermittent electrical problems are sometimes resolved by disconnecting and reconnecting connectors. It is very impor-
tant to check for diagnostic codes immediately before disconnecting a connector. Also check for diagnostic codes after recon-
necting the connector. If the status of a diagnostic code is changed due to disconnecting and reconnecting a connector, there
are several possible reasons. The likely reasons are loose terminals, improperly crimped terminals, moisture, corrosion, and
inadequate mating of a connection.
WARN I N G
The connection of any electrical equipment and the disconnection of any electrical equipment may cause an
explosion hazard which may result in injury or death. Do not connect any electrical equipment or discon-
nect any electrical equipment in an explosive atmosphere.
CAU T I ON
Always use a crimping tool to service Deutsch HDand DT connectors. Never solder the terminals onto
Always use a wedge removal tool to remove wedgesfrom DT connectors. Never use a screwdriver to
pry a wedge from a connector.
Always use a breakout harness for a voltmeter probe or a test light. Never break the insulation of a
wire in order to access to a circuit for measurements.
If a wire is cut, always install a new terminal for the repair.