8/18/2019 Relay Test JS 091907
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RELAY TEST JOBSHEET
Name ________________________ Station _________________ Date
______________
Objective
Upon completion of this job sheet you will have demonstrated the
ability to test a
standard automotive relay. You must know how to perform this
task to pass the ASE
Electrical Test.
Tools and Materials
Vehicle DVOM
Alldata Jumper Wires
Power Probe
Protective Clothing
Safety Glasses
Describe the vehicle being worked on:
Year ________ Make __________________________ Model
_____________________
VIN ________________________________ Engine type and size
__________________
PROCEDURE
1. Pull the vehicle into the shop and locate a standard
underhood relay.
2. Remove the relay and identify the standard terminals as shown
on the next page.
3. With the relay de-energeized, measure the resistance between
terminals 30 & 87a.
It has _______________________ohms of resistance.
4. What should the resistance be? ___________________ohms
5. With the relay de-energeized, measure the resistance between
terminals 30 & 87._______________________ohms
6. What should the resistance be? ___________________ohms
7. With a power probe or jumper wires, apply 12V to terminal 86
and ground to
terminal 85. You should hear the relay “click”. Do you?
________________
8/18/2019 Relay Test JS 091907
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8. With power and ground applied to the relay (energized)
measure the resistance
between terminals 30 & 87a. It has ____________________ohms
of resistance.
9. What should the resistance be? ___________________ohms
10. With power and ground applied to the relay (energized)
measure the resistance
between terminals 30 & 87. It has ____________________ohms
of resistance.
11. What should the resistance be? ___________________ohms
Based on the tests above is the relay good or bad?
_____________________
Problems Encountered
