Manual 36541 Solenoid Troubleshooting Guide
Woodward 13
Solenoid Coil Resistance Check
1. Make sure the solenoid is at room temperature (70°F / 21°C) before checking
the resistance.
2. Disconnect solenoid electrical connector from the wiring harness connector
if solenoid is installed on the application.
3. Use an ohmmeter capable of measuring at least tenths of ohms or better.
“Zero” adjust the meter before measuring.
4. For internally switched solenoids, pull the plunger all the way out and then
check the reading between positive and negative terminals for pull coil
resistance. Now, manually move the plunger all the way in to activate the
internal switch. Hold the plunger in this position and check the reading again
between the positive and negative terminals to obtain hold coil resistance.
5. For externally switched solenoids, pull coil resistance is read between White
and Black wires and hold coil resistance is read between Red and Black
wires. For externally switched solenoids with switch caps and screw or
blade type terminals, use the label to identify and measure the pull coil and
hold coil resistance.
6. Refer to the coil resistance chart (1A or 1B) for the correct values.
NOTE
Some specially manufactured solenoid units may not follow
the general wire color scheme presented here.
Figure 7. An Ohmmeter to Measure Resistance is Recommended.
To Next Page
Loading...
Need help?
General
