AIR CLEANER SERVICE INDICATOR
SWITCH TEST (See Figure 10G-22)
The air cleaner service indicator switch is a normally
OPEN (NO) switch. When the air filter becomes re-
stricted and 25" H
2
O of vacuum is reached, the switch
will close.
FIELD TEST
Using a jumper wire, remove both the BLU/WHT and
BLK wire and connect them together.
• Air filter light comes ON, proceed with switch test,
Step 1.
• Air filter light does not come on, check circuit wiring
and/or bulb.
SWITCH TEST
1. Set multimeter to 200 Ω (ohms) scale.
2. Connect test leads as shown.
•
There should be no continuity through switch.
3. Draw 25" H
2
O vacuum on switch, switch contacts
should close, there should be a reading of 0–0.5
Ω (ohms).
Replace a switch that does not meet all the above
test results or has resistance of 0.5 Ω (ohms) or more.
ELECTRICAL SYSTEM
SECTION 10G. SWITCHES
10G-22
Figure 10G-22. Air Cleaner Service Indicator Switch Test
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