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EXTERNAL DOOR SENSOR INSTALLATION GUIDE

With the wires along with the mounting pad on the ceiling of the 
trailer combine Yellow and Black wires and then connect either one 
wire (no polarity on 2 wires) to the TT603’s Pink (RS232 Rx) wire and 
the other wire to the TT603’s Purple (12 VDC out) wire through the 
following steps

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1. Strip 2 wires jacket to 7mm.

2. Insert the whole stripped wire into splice and crimp it with

tools (suggest using Crimp Hand Fixer KY-8161 as following
image shows). 

3. Insert crimped splice into heat tube as follows

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4. Do the same for the TT603’s Pink (RS232-Rx) wire (Refer to Figure 1). 

5. Move the heat tube to cover the whole splice

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6. Heat the tube using a blower or lighter until the tube is shrunk, 

suggested temperature is about 350 °C (662 °F)

.

7. Repeat the above steps for combining the other wire and

connecting them to the TT603’s Purple (12 VDC out)
wire. (Refer to Figure 1)

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Copyright © 2019, Flex.  All rights reserved. 

ENG-DSS-1-001-00 V1.0

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