GMC 4000 Series Service Manual page 529

Sec. 12
Page 518
CHASSIS ELECTRICAL A N D INSTRUMENTS
W IRING HARNESS
CONNECTOR
WIRE TERMINAL
Figure 2 — Rem oving Twin-Lock Connector Terminals
M AINTENANCE A N D REPAIR
All electrical connections must be kept clean
and tight. Loose or corroded connections may
cause a discharged battery, difficult starting, dim
lights, and possible damage to generator and reg­
ulator. Wires must be replaced if insulation be­
com es burned, cracked, or deteriorated.
Whenever it is necessary to splice a wire or
repair one that is broken, always use rosin flux
solder to bond the splice and insulating tape to
cover all splices or bare w ires.
When replacing w ires, it is important that the
correct size wire as shown on applicable wiring
diagram in "Wiring Diagrams" booklet be used.
Each harness or wire must be held securely in
place by clips or other holding devices to prevent
chafing or wearing away insulation due to vibration.
G M C S E R V I C E M A N U A L
TERMINAL
REMOVER TOOL
Figure 3 — Fusible Links a n d Am m eter Fuses (Typical)
CAUTION: Never replace a wire with
one of a smaller size. DO NOT replace a
fusible link with a wire of a larger size.
By referring to the wiring diagrams inapplic­
able "Wiring Diagrams" booklet, circuits may be
tested for continuous circuits or shorts with a
conventional test lamp or low reading ohmmeter.
REPLACING WIRING
CONNECTOR TERMINALS
Either blade-type or twin lock type terminals
are used in the wiring harness connectors. Mating
ends of the connectors are secured by tang locks
which must be disengaged at the same time to sep­
arate the connector.
Terminal Removal
1. To remove a blade-type terminal from the
connector, disengage lock tangs and separate con­
nector. Insert a thin bladed instrument under mat­
ing end of connector terminal and pry up on term ­
inal being careful not to damage connector. Pull
wire and terminal from connector as shown in
figure 1.
2. To remove a twin lock type terminal from
connector, disengage the lock tangs and separate
connector. Insert terminal remover (J-21091) or
equivalent, as shown in figure 2 to disengage term ­
inal locks from the connector. Pull wire and term ­
inal from cable connector.
Terminal Installation
NOTE: If original terminals are to be used,
FU SIBLE L IN K S
A M M E T E R F U S E S