K-FORCE® 21” & 27”
SpeedTech Lights, Inc © 2018
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How the Grand Control™ Box Switch Operates Your STL Light Bar
Left On/Off Switch:
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On Position: Turns on all the LED Modules in your light bar
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Off Position: Turns off all the LED Modules in your light bar
Flash Pattern Button:
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Button cycles to the next flash pattern with each press. Non-Volatile memory recalls the last flash pattern selected.
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Hold flash pattern button down for 3 seconds to toggle Steady Burn mode.
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Hold flash pattern button down for 5 seconds to toggle Random pattern mode.
Wiring: Connecting Wires to the Battery
WARNING! If you are supplying your own wiring that connects to the positive or negative terminal of the battery, fuse sizes must be sized accord-
ing to STL’s provided fuse to be considered fused properly to the battery in order to carry the load.
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Route the power cables by opening the wiring shield and running the cables through it towards your vehicle’s firewall.
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Follow the factory wiring harness through the firewall.
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If it is necessary to drill a hole in the firewall for the power cables, be sure no components will be damaged from drilling. As with all holes
that are drilled, file the edges down smooth and insert a grommet to protect the cables.
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Route the cable along the factory wiring harness towards the battery.
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Wire your power cables (Red with In Line Fuse (STL Supplied) and Black cable) to your battery to power up your Light Bar.
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You will want to ensure your grounding cable is taken directly to the negative terminal of your battery to avoid any electrical feedback
which may disrupt your Light Bar system.
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DO NOT allow the positive (Red wire) and negative (Black wire) to touch one another. This may cause injury to you and damage your equip-
ment by causing a short in the unit that is not covered under the STL warranty.
Wiring: Connecting Wires to Control Box
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This unit will feature a power harness with eight (8) colored leads with a connector that plugs into the Grand Control™ Box. When not utiliz-
ing the Grand Control™ Box reference the Wiring Diagram above.
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Now that you have pulled the cable into the vehicle attach the connector back to your Light Bar’s wire harness in the CORRECT positions
using a pin pusher and plug it into your Grand Control™ Box. If you do not know the correct position of each wire in the connector call
customer service at 800-757-2581 before proceeding.
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If you did not purchase the Grand Control™ Box and are using your own switch box , wire the cables accordingly into your control panel by
referencing the wiring diagram and instruction manual of your control panel.
