In-Situ Con TROLL PRO Installation Manual (purchased after 10 May 2012) - Manual (Page 26)

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4. Thread the opposite end of the cable through the dome connector and into the
battery enclosure.
5. Firmly tighten the dome connector with a wrench.
Connect the Battery Terminals
1. Place the batteries in the enclosure as shown.
2. Connect the black (–) leads to the black terminals.
3. Connect the red (+) leads to the red terminals.
Upon connection of the red leads, you should notice that the controller screen
illuminates.
Figure 6.1 Internal components of the battery box