1975 Datsun 280z FSM - Spooled up Racing

Body Electrical System
TROUBLE DIAGNOSES OF SYSTEM
SYSTEM CHECK ON CAR
STEP 1.
A harness checker should always be used when
anything goes wrong with this system.
Do not attempt to disassemble or adjust the interlock
unit. Trouble shooting should begin by checking
whether or not the conditions alleged by the customer
recur.
Starting motor will not rotate, therefore engine will
not start. Repeat above operations after connecting
new interlock unit with connectors.
Engine starts properly.
The system is in good condition.
Starting motor will not rotate, therefore engine will
not start.
System problem other than interlock unit. Proceed to
STEP 2 or 3.
Engine starts properly.
Interlock unit problem.
Replace interlock unit.
STEP 2.
Inspection with the harness checker.
1. Disconnect interlock unit at connectors.
2. Connect the checker with connectors as shown
below.
Identify which check light is off and check interlock
relay operation.
Replace interlock relay if inoperative and replace the
parts indicated by each check light which remains off.
Fig. BE-149
BE174A
Connecting the checker with dash harness connectors
BE-91