Installation manual

42
Installing the UFLS Harness (Option)
“Solid State” Ultrasonic Fuel Level Sensor (UFLS)
Harness Installation and Routing
NOTE: The Ultrasonic Fuel Level Sensor (UFLS) is an option for 22”
50 gallon fuel tanks only and requires Interconnect Harness Kit
702414.
1. Locate the short factory installed fuel level sensor harness with the
3-pin connector. This connector is located outside
the control box and
band wrapped to other harnesses at the rear of the unit near the frame
mounted ground plate.
• Apply a light coating of Superlube or equivalent to this connector.
• Connect the 30 ft. (9.1 m) Interconnect Harness to the mating
3-pin connector on the factory installed harness.
2. Route the harness to the fuel tank using trailer’s harness conduit or
chase to avoid interference with fifth wheel plate area.
NOTE: Thermo King recommends a conduit or chase with 1.00 in
(25.4 mm) I.D. to accommodate the electrical harness.
Harness Connections
IMPORTANT: The use of the supplied crimp and solder style
connectors with separate heat shrink tubing is required when
connecting the sensor harness to the UFLS.
3. Cut the interconnect harness to length and splice wires to the fuel
sensor’s leads:
• Slide supplied heat shrink tubing onto each wire and position them
away from joint.
• Connect each wire with wire connector and crimp securely.
• Solder wires to wire connectors with a soldering gun.
• Slide heat shrink tubing over each wire connector and applying heat
with a heat gun.
IMPORTANT: DO NOT burn the heat shrink. If the heat shrink is burnt,
charred, or has bubbles from overheating, the wire connections must
be removed and redone correctly.
4. Use supplied cable ties, clamps and screws to secure the harness.
IMPORTANT: This is a “Solid State” fuel level sensor and the SR-2
Controller must be programmed accordingly to enable the fuel level
feature.
DANGER: Do not route electrical wires with fuel lines as this
could cause a fire!
J3 Connector at
Controller
Interconnect Harness
Outside Control Box
Fuel Sensor Leads
PIN 12 2PL PIN A GREEN RED
PIN 35 FUELN PIN B BLACK BLACK
PIN 23 FLL PIN C WHITE YELLOW