Dover HEIL Command-SST - Page 154

Issued June 2020
Maintenance
Copyright 2020, Heil Environmental
Printed in U.S.A.
144
PROXIMITY SWITCH TROUBLESHOOTING TABLE
If the controller input light stays on when a switch is
unplugged (the signal wire is carrying +12V DC)
Check the proximity switch electrical circuits for the source of
the problem.
If proximity switch LED light is NOT ON.
1. Check the fuse relay block (Half/Packs with IFM controllers).
The fuse/relay box is located in the cab. Or
Check the in-line fuses (Side Loaders with IFM controllers).
The in-line fuses are located in the cab.
2. Unplug proximity switch.
3. Check the power wire (terminal C) for +12 VDC with a multi-
meter.
4. Check ground signal with multi-meter for continuity to
chassis ground.
5. Check the signal wire for continuity to appropriate controller
input terminal. See Service Manual.
6. If all three (3) wires are good, replace the proximity switch.