MAINTENANCE OF ELECTRICAL SYSTEMS- Continued
TESTING ELECTRICAL SYSTEM
a. Check for Grounds.
(1) Disconnect all wiring connectors at the lights. Be sure identification markers are present
on individual wires before disconnecting. If not, tag wires.
Check for continuity on grounds using the multimeter on a low ohms scale.
(2) Check for continuity between wiring harness connector pin D and the chassis. If the
circuit is open, repair ground lead on wiring harness.
(3) Check for grounds between wiring harness connector pins A, B, C, E, F and J and pin D
(ground). (Refer to schematic diagram, WP 0015 00-7.) There should be an open circuit
between the connector pins. If there is continuity between any connector pin as
specified, that circuit is grounded and the wiring harness must be repaired or replaced.
(5) Check for grounds from each light lead wire and the chassis (ground). There should be an
open circuit between each lead wire and the chassis. If there is continuity on any lead
wire, the wire is grounded and must be repaired or the light replaced.
b. Check Wiring Harness Continuity.
(2) Check for continuity between each light lead wire and the chassis. If there is an open
circuit, first check lamp. If lamp is defective replace it. If there is still an open circuit,
repair lead wire or replace light.
(3) Connect all wire connectors at lights.
(4) Check for continuity between wiring harness connector pins A, B, C, E, F and J and pin D
(ground). Each circuit should indicate continuity. If not, there is a broken wire and wiring
must be repaired or replaced.
c. Check Intervehicular Cable Continuity.
Check for continuity between individual connector pins and socket on opposite ends of cable
at terminals A, B, C, D, E, F and J. Each circuit should indicate continuity. If any circuit is
open, replace cable.