System Planning | 17
CONSIDERATIONS PRIOR TO INSTALLATION
COMMON GROUND REQUIREMENTS
The Main Unit, Battery Monitor and all other components in your setup must share a common electrical
ground point for correct system operation. This can be achieved by connecting all grounds to a common
ground busbar or by a good quality connection to the vehicle chassis (if appropriate).
USING A COMMON GROUND BUSBAR
Consider the location of the busbar, ensuring it's mounted in a central location to avoid excessive cable
lengths. The common ground busbar must be capable of carrying all current loads — see 'Typical Manager
Setup' (page9) for further information.
USING VEHICLE CHASSIS
Good quality electrical connections to a chassis can only be achieved if the connection is free of paint,
protected against corrosion, and has a suitable fastener. The common ground must have a robust electrical
connection to the battery earthing point.
VEHICLE IGNITION REQUIREMENTS
VEHICLE ALTERNATOR TYPE
Conrm the type of alternator your vehicle has by checking for a battery sensor on your vehicle's start
battery as illustrated below. This will indicate if a vehicle ignition connection is required for the Manager to
function correctly.
If your vehicle has a variable‑voltage (smart alternator) the vehicle ignition connection will need to be made
at a point that is live only when the ignition is turned on. For Idle‑stop vehicles, connect the vehicle ignition
cable to D+ or an ignition switched fuse in one of the vehicle's fuse boxes.
All other vehicles are assumed to have a xed voltage or temperature compensating alternator (standard).
These alternators do not require a vehicle ignition cable connection, however REDARC recommends
connecting a vehicle ignition cable to a point that is live only when the ignition is turned on for the best
performance.
CONNECTION TYPE
If a vehicle ignition connection is required for your installation, use a 6.35 mm (0.25") sized FASTON.
Vehicle Alternator Type Connector Type
Regular Battery Terminal
(Standard Alternator)
Battery Terminal with Sensor
(Smart Alternator)
6.35 mm
(0.25")
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