Installation manual
56
Installing the Door Switch (Option)
When installing CargoLink wireless door switches, see TK 55151 CargoLink Installation Manual. 
NOTE: These instructions (pages 56-59) are intended as reference 
guide only to assist with a typical hard
 wired door switch installation. 
Your installation may be different depending on the trailer, the 
amount and types of doors and the customers particular 
requirements. 
Door Switch Components
The door switch consists of a magnet, a switch, non-magnetic mounting 
hardware and a interface harness to connect to the host unit.
• The magnet is always mounted on the door.
• The switch (with harness) is always mounted to a stationary location.
• Two short interface harnesses are available depending on your 
particular kit. One allows a single door switch in a single zone to 
activate a unit shutdown. The other allows two door switches in the 
same zone to each activate a unit shutdown.
Non-magnetic mounting hardware is included to install the switches. If 
alternate hardware is used it must also be non-magnetic or the door switch 
will not operate properly.
Installer is to supply and fabricate the harness connecting the interface 
harness to the door switch per the table below. The harness should be 18 
AWG or better, 3 wires, color coded RED, BLACK and WHITE.
Mounting Locations
The door switch can be mounted on the inside or outside of either swing 
out or roll-up doors and can be mounted in various positions to 
accommodate particular applications. 
IMPORTANT INSTALLATION NOTES:
• The door switch must be installed away from traffic (i.e. forklifts) or 
protected from it.
• The door switch and magnet must be installed parallel to each other, 
not perpendicular. Long cross hair aligns to long cross hair.
• It is important that a maximum gap of 12.7 mm (0.50 in.) is maintained 
between the door switch and the magnet. Shims may be required and 
must be a non-magnetic material (aluminum, wood, plastic, etc.) or the 
door switch will not operate properly.
(Detail A) Ceiling Mounted 
1. Mount the magnet flush with the top edge of the door and secure with 
supplied hardware. 
2. Close the door and mount the switch to the door sill parallel with the 
magnet, being sure the “cross hairs” are aligned and that the maximum 
gap of 12.7 mm (0.50 in.) is maintained. 
(Detail B) Floor Mounted 
1. Mount the magnet flush with the bottom edge of the door and secure 
with supplied hardware. 
2. Close the door and mount the switch to the floor parallel with the 
magnet, being sure the “cross hairs” are aligned and that the maximum 
gap of 12.7 mm (0.50 in.) is maintained.
(Detail C) Outside Door Installation
1. Mount the magnet flush with the top edge of the door and secure with 
supplied hardware.
2. Close the door and mount the switch to the door sill parallel with the 
magnet, being sure the “cross hairs” are aligned and that the maximum 
gap of 12.7 mm (0.50 in.) is maintained.
Interface Harness Wiring Door Switch Wiring
RED = (12 Vdc) POWER RED = (12 Vdc) POWER
BLACK = (CH) GROUND BLACK = (CH) GROUND
WHITE = (DS) OUTPUT WHITE = (DS) OUTPUT










