250V MAX
15A MAX
FUSED
DC
15A
20M
200
K
20K
2K
200
8CYL
6CYL
TACH
X10
5CYL
4CYL
8CYL
OHMS
15
A
COM
• If you hear tone - The switch is closed.
• If you don’t hear tone - The switch is
open.
8. Repeat Step 7 to verify switch operation.
Good Switch:
Tone turns ON and OFF as
you operate switch.
Bad Switch:
Tone always ON or tone al-
ways OFF as you operate switch.
14
4. Touch RED and BLACK test leads to-
gether and listen for tone.
5. Connect BLACK test lead to one side of
coil.
6. Connect RED test lead to other side of
coil.
7. View reading on display.
• Typical solenoid / relay coil resistances
are 200
Ω
or less.
• Refer to vehicle service manual for your
vehicles resistance range.
8. Test Results
Good Solenoid / Relay Coil:
Display in
Step 7 is within manufacturers specifica-
tion.
Bad Solenoid / Relay Coil:
• Display in Step 7 is not within manufac-
turers specifications.
• Display reads overrange on every ohms
range indicating an open circuit.
NOTE: Some relays and solenoids have
a diode placed across the coil. To test this
diode see Testing Diodes on page 10.
To test Solenoids and Relays (see Fig. 17):
1. Insert BLACK test lead into COM test
lead jack.
2. Insert RED test lead into
test
lead jack.
3. Turn multimeter rotary switch to
200
range.
Most solenoids and relay coil resistances
are less than 200
Ω
. If meter overranges,
turn multimeter rotary switch to next higher
range. (see Setting the Range on page 6)
Testing Solenoids and Relays
This test checks to see if a solenoid or relay
have a broken coil. If the coil tests good, it is
still possible that the relay or solenoid are
defective. The relay can have contacts that
are welded or worn down, and the solenoid
may stick when the coil is energized. This test
does not check for those potential problems.
Fig. 17
Relay or
Solenoid
Red
Black