TK 56430-18-IP-EN
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Section 7 - Electrical Standards
Overview
The Electrical Standards section of this manual defines how to properly connect the Thermo King electrical harness to
the individual components and to the vehicle’s electrical system.
This section covers both low voltage (12 Vdc) and high voltage (115 or 230 Vac) connections.
Dielectric Grease
Dielectric grease is a non-conductive, silicone-based grease that is designed to seal out moisture and prevent corrosion
on electrical connectors. The following applies to the use of dielectric grease:
• A light film should be applied only to low voltage sealed connector pins.
• DDOO NNOOTT use on high voltage components.
• DDOO NNOOTT use on fuses.
Figure 61. Apply a light film of dielectric grease to the pins of one end of the connectors.
DC Low Voltage Harnesses
Vehicle powered truck units operate on low voltage (12 Vdc) with harnesses routed to the systems individual
components and to the vehicle’s battery or ignition system. The main harness supplied with the unit comes
preassembled with connectors installed. These connectors simply plug into the mating connectors of the unit’s
individual components (e.g., evaporator fan motors, in-cab controller, etc.). Refer to the unit specific installation
manuals for individual component connections and locations.
IImmppoorrttaanntt:: Harnesses with factory installed connectors are not to be cut, shortened, or otherwise modified by installer.
NNoottee:: Some individual wires (e.g., main power, controller, and battery ground) are provided without connectors. These
wires will need to be cut to length by the installer, properly terminated, and connected during unit installation.
Two types of low voltage electrical connectors are used: Sealed and Unsealed.
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