HYDRAULIC CHARGE FILTER
SWITCH TEST (See Figure 10G-18)
The charge filter switch is a normally OPEN (NO) switch.
When the hydraulic oil pressure at the inlet of the charge
oil filter increases above 20 psi the switch CLOSES and
the hydraulic charge filter light comes ON.
FIELD TEST
At the switch, remove both wires from switch and con-
nect together.
• Light comes on, proceed with switch test, Step 1.
• Light does not come on, check circuit wiring and/or
bulb.
Charge filter light comes ON when ignition switch is
turned on and stays ON when engine is started.
Remove BLU wire from switch terminal.
• Light goes off, proceed with switch test, Step 1.
• Light does not go off, check circuit wiring for ground.
SWITCH TEST
1. Set multimeter to 200 Ω (ohms) scale.
2. Connect test leads as shown.
•
There should be no continuity and the meter
should read 0–0.5 Ω (ohms).
3. Increase pressure above 20 psi.
•
Switch contacts should close.
NOTE
If switch tests okay and the charge filter light still
does not go out, charge filter should be changed.
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-18
Figure 10G-18. Hydraulic Charge Filter Switch Test
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