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Wiring Guides

Need your REDARC product to be installed or setup and require more detailed information? View our extensive list of detailed wiring instructions below or contact your local auto electrician for further assistance.

Brake Controllers

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TESTING YOUR TOW-PRO ELITE

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WIRE UP YOUR TOW-PRO

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UNBALANCED ELECTRIC BRAKING

Can be detected by:
Trailer pulling to one side during braking.
One wheel hub getting hotter than the other.
Linings on one side wearing more than the other.

Can be caused by:
Broken wire or open circuit coil one side.
Unbalanced trailer loading.
Incorrect mechanical adjustment of one side.
Mismatched linings fitted.
Mismatched tyres.
Broken or disconnected spring in a brake assembly.
More friction one side due to extra corrosion in one brake drum.
Bearing lubricant leaking on to linings one side.
Contamination one side, E.g. a piece of broken spring or a rock embedded in lining.
Unbalanced wiring, see diagram to the left.

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Chargers & Isolators

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BCDC DUAL WITH JUMP-START - THE NEW ULTIMATE DUAL BATTERY SETUP

Customers have been a fan of our 'Ultimate Dual Battery setup' for years now as it enables all the benefits of charging through a BCDC and the safety and convenience of an added jumpstart feature. Addionally, Solar could be added on BCDC1225(-LV) and BCDC1240(LV) installations with the 'BCDC with 12V and Solar Inputs and Jump Start Feature' diagram.

With the release of our new Dual Input BCDC's to our range, the setup is even easier! As per the diagram below, a SBI12 can be used and no relays are required.

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BCDC1240 WITH 12V AND SOLAR INPUTS AND JUMP START FEATURE

Learn to wire a BCDC1240 Jumpstart with Anderson and Solar. Download the diagram below:

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BCDC INSTALLATION WITH EXISTING DISTRIBUTION UNITS AND BATTERY COUPLERS

• The BCDC installation should replace the battery coupler so the start and auxiliary battery are no longer connected in parallel when the vehicle is running.
• If the auxiliary battery distribution and display system receives its start battery voltage reading from the
battery coupler circuit this feature may no longer work.
• If the auxiliary battery distribution system charges the start battery through the battery coupler circuit,
this feature may no longer work.
• This is a generic diagram for illustration purposes. Your specific system diagram can be modified by
REDARC to assist with your BCDC installation; Please contact Redarc at power@redarc.com.au

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DUAL BCDC SETUP

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BCDC WITH JUMPSTART AND LOAD CONTROL SWITCH

Learn to wire a BCDC with Jumpstart and Load Control switch. Download the diagram below.

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BCDC1240 JUMPSTART WITH ANDERSON AND SOLAR

Learn how to wire a BCDC1240 Jumpstart with Anderson and Solar. Download the diagram below.

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BCDC INPUT SWITCHING

Learn to wire a BCDC Input Switching. Download the guide below.

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BCDC 3 WAY ANDERSON SETUP

Learn to wire a BCDC 3 way Anderson setup. Download the guide below.

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12V/24V JUMP START IN 12V VEHICLE

Learn to wire 12v/24v jump start in 12v vehicle. See the four different options below showing you how to get the job done in no time!

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12V/24V JUMP START IN 24V VEHICLE

Learn to wire 12v/24v jump start in 24v vehicle. See the two different options below showing you how to get the job done in no time!

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ALWAYS START FROM BOTH BATTERIES

Learn to wire starting from both batteries. See the guide below.

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USING A SBI12 ISOLATOR AS A LOW VOLTAGE CUTOUT

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SBI12, POSITIVE CHASSIS INSTALL

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WINCH FROM BOTH BATTERIES

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BASIC SBI INSTALL

Learn to wire a basic SBI install. Download the guide below.

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SBI12D WITH SINGLE AUXILIARY

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BETTER PARALLEL CHARGING

The Usual Way (Usual Connection)

When a vehicle has a second battery installed, even if both batteries are the same size, type and age, it is often
found that one battery receives the “lions share” of charge and the other takes a much longer time to become fully
charged. A major cause of this is the method of wiring the two batteries together. Most installations involve the
addition of the second battery to the standard factory installed battery and the simplest way is to wire it this way.
Because of the resistance in the POS wire connecting the second battery, most of the current from the alternator
takes the “path of least resistance” and goes through the first battery. This results in the first battery receiving more
charge than the second.

A better way (Preferred Connection)

There is a way of overcoming this problem, eliminating it as a cause of unequal charging. This requires the first battery to be earthed at the second battery negative terminal as shown:
When the batteries are wired this way, the effects of resistance in the POS and NEG wires cancel each other out and both batteries receive a more equal charge.

What about isolators? (Isolator Connection)

Sometimes, when an isolator is used, this same effect is noticed. In this instance, the ideal would be for the resistance in the NEG wire to be the same as the resistances in the POS wire and the solenoid contact combined. A good quality solenoid has extremely low resistance and may not contribute too much to the effect, but if this is suspected as being a problem, an increase in length of the NEG wire will reduce the problem. If solenoid contact resistance cannot measured or required wire length calculated, some "trial and error" may help select any additional NEG wire length.

Too hard?

While this may sound difficult, it will in most cases solve the problem without the expense of a more sophisticated alternator or electronic "black box".

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Gauges

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GA-ELC DIMMING GAUGES IN REVERSE

The REDARC Enhanced Lighting Controller is to be used when you do not have a dimming circuit to connect your gauge to or the dimming circuit in your vehicle does not dim the REDARC gauge to your liking.

In some installations the GA-ELC will dim in reverse to the vehicle’s dash lighting (ie, darker gauge when the dash brightens or vice-versa).
The below diagrams show how to wire the GA-ELC to enable dimming the correct way.

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INSTALLING 52MM GAUGES INTO A LOCATION WITHOUT DASH OR PARK LIGHTS

When wiring a gauge into a location other than a car dashboard (for example, in a caravan), Park and Dash lights may not be available.

The below diagram shows how to install a gauge using switches to simulate ignition and dash-lights, providing a simple way to switch the Gauge ON/OFF both With/Without the backlight active. The current draw of the backlight is approximately 40mA per gauge. 

The Secondary connector should be wired according to the wiring diagram in the Gauge's user manual.

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