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2 INSTALLATION
2.2.1 Red Wire (Vehicle Brake light) Connection
The requirements for a suitable connection of a brake controller trigger wire are
quite specific. This connection point must:
• Provide a voltage of the same voltage level as the “Start Battery*” while the
vehicle brakes are applied.
• Have 0 volts output while the vehicle brakes are not applied
• Accept battery voltage input when the brake controller manual over-ride is
operated and illuminate at least the trailer brake lights.
• Accept the battery voltage input as above without causing any damage, spurious
vehicle operation or erroneous fault indication.
A relay should not be installed to drive the red wire as this would prevent the override
feature from working and may introduce dangerous voltage spikes.
* Start Battery voltage output means, directly from the Start Battery and within 0.4V of Supply (Black
wire) voltage.
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