Note: This instruction Guide is for Credo units with a serial number over 4500

For previous versions download the pdf installation guides below

Serial no. under 4500
Download PDF
Serial no. over 4500
Download PDF

General Installation Instructions

  • Mount the brake controller according to the orientation instructions below.
  • Wire the brake controller according to the instructions on diagrams below.
  • It is important that trailers fitted with the Credo™ braking system are also fitted with 12/24 volt LED lights, not voltage specific incandescent or LED lights.
  • Controller must be mounted to a metal surface which is mounted to the main chassis.
  • White wires are interchangeable
  • Orange wires are interchangeable

Electric Installation Instructions

  • The controller is capable of running trailers with up to 4 wheels braked with electric drum brakes.
  • The earth from the trailer brakes and the trailer battery must only connect to the brake controller output earths as shown in the diagram. They cannot be connected to a common chassis earth.
  • Cable gauge should be sufficient size to avoid voltage drop. For electric drum brakes a minimum of 15 amp cable should be used and a separate feed should be run per two wheels that are fitted with brakes.
  • Magnet wires are interchangeable, for brakes positive and earth.

Hydraulic Installation Instructions

  • The earth from the BrakeRite actuator and the trailer battery must only connect to the brake controller output earths as shown in the diagram. They cannot be connected to a common chassis earth.
  • Cable gauge should be of sufficient size to avoid voltage drop. The main power feeds to the actuator from the brake controller should be minimum 20amp.
  • Mount the actuator in a protected position. Orientation is not important for this but filler caps should be level and upright.
  • Do not run the actuator without fluid as this will damage the pump.
    Use new DOT 3 or DOT 4 brake fluid.
  • Bleed the brakes by activating the breakaway switch. However, do not run the actuator continuously for more than 1 minute every 5 minutes. All air must be removed from the system for the brakes to work correctly. Ensure that the fluid level does not drop below 20mm from the filler cap opening to avoid more air being pumped into the system.
  • Purple and Brown wires in pump are not used and must be isolated.

Orientation Guide


Electric / Hydraulic Wiring Diagram


 Pre-Assembled General Installation Instructions

  • Mount the brake controller according to the orientation instructions above.
  • Wire the brake controller according to the instructions on diagrams below.
  • It is important that trailers fitted with the Credo™ braking system are also fitted with 12/24 volt LED lights, not voltage specific incandescent or LED lights.

Pre-Assembled Hydraulic Installation Instructions

  • Do not run the actuator without fluid as this will damage the pump.
    Use new DOT 3 or DOT 4 brake fluid.
  • Bleed the brakes by activating the breakaway switch. However, do not run the actuator
    continuously for more than 1 minute every 5 minutes. All air must be removed from the system
    for the brakes to work correctly. Ensure that the fluid level does not drop below 20mm from the
    filler cap opening to avoid more air being pumped into the system.
  • The multi core cable must be wired directly to the trailer plug, and it is important that the earth wire from that cable must only be earthed using the trailer plug earth pin, i.e. it cannot be connected to a common chassis earth.
  • The twin core cable joins to the breakaway switch cables.
  • Connect the cable marked trailer lights from the on-trailer module to the trailer tail camp circuit.
    DO NOT bypass this directly to the trailer plug.
  • The on-trailer module assembly can be mounted off centre side to side, but MUST BE,
    A) parallel with the front-rear centre line of the trailer, and
    B) mounted level on the trailer in its loaded state.

Hydraulic Pre-assembled Wiring Diagram


Troubleshooting

Fault

Possible Causes

Repairs/Checks

In-cab controller shows ‘Low Trailer Battery’ warning (old style In-cab Controller shows Eb Error)

Or

No tail lights / tail lights go out when brakes are applied.
  • Battery is excessively discharged.
  • Bad connection between trailer mounted brake controller and battery.
  • Blown battery fuse.
  • Poor connection on battery terminals.
  • Check battery is over 12.5V when disconnected. If lower replace the battery.
  • Check if battery is charging by disconnecting the battery leads, connect to vehicle and switch lights on. Then check for 14V on the end of the battery leads. A measurement of 14V means the charger is working – if no voltage then a replacement or repaired controller is required.
  • Check leads, fuse holder and any connections between the battery and controller for poor / corroded connections. Any high resistance joins will cause excessive voltage drop to the controller under braking resulting in the ‘Low Battery’ error.
In-cab controller shows ‘Please Drive with Your Headlights On’ message, even though the headlights are on.

(old style In-cab shows Ec Error).
  • Serial number mismatch between Controller and Trailer.
  • Faulty trailer plug.
  • In-cab controller cannot communicate with the trailer mounted controller due to interference.
  • Incorrect wiring by-passes controller.
  • Poor connection on battery terminals.
  • Obtain serial number: Refer to page 5
    If they do not match then follow instructions on page 6/7.
  • Check trailer plug pins are not corroded or crushed in, and either spread the pins, remove corrosion or replace the plug.
  • Check the controller to In-cab connection by taking the in-cab unit back to beside the trailer mounted controller, if still error is still present controller needs to be replaced or repaired.
  • Check the vehicle connection goes to only the trailer mounted controller and all tail and marker lights from the controller lights output.
Brakes randomly come on and lock up.
  • Faulty Break-away switch.
  • Faulty Break-away wiring.
  • In-cab controller has ‘emergency stop’ button pressed.
  • Check breakaway switch and wiring for a short circuit. Replace any faulty components or wiring.
  • Make sure In-cab controller is securely mounted on vent holder and emergency stop button not inadvertently pressed.
Braking output on In-cab controller stays at ‘-‘ on the screen when brakes are applied.
  • Faulty trailer plug / vehicle connection.
  • Incorrect wiring bypasses controller.
  • Check and repair trailer plug and vehicle socket and associated wiring – replace any faulty parts.
  • Check vehicle connection goes directly to the controller and does not bypass the controller.
In-cab Controller shows ‘0’ or higher numbers when brakes applied but no braking happens.
  • On electric drums – Faulty wiring or magnets.
  • On hydraulic actuator driven brakes – Faulty wiring or isolator if fitted
  • On electrics check wiring and drum magnets for faulty connections. Normal magnet resistance is 5 Ohms. 2 Magnets together is 2.5Ohms and 4 is 1.25 Ohms.
  • On Hydraulic the Blue signal wire should be checked for voltage when the emergency stop being is pressed. If there is some voltage and there is no brakes then call for assistance.

Warranty Terms and Conditions

LIMITED 18 MONTH WARRANTY CONDITIONS

Trailequip Ltd warrants that the mechanical and electrical components of the TRAILPARTS/CREDO products as listed below will be free of defects in material and workmanship for a period of eighteen months from the original date of purchase.

Whilst we take every effort to ensure compatibility with all known vehicles we cannot guarantee 100% compatibility for all vehicles.

To obtain any warranty service, you must provide Trailequip Ltd with proof of purchase, such as a copy of your tax invoice or purchase receipt, which will include a purchase date and the serial number of your product. This warranty does not cover the removal or re-fitting of the product.

TRAILPARTS/CREDO will, at its discretion, repair, replace or refund the purchase price of a defective product or component, provided you return the defective product or component during the warranty period, freight charges prepaid, to Trailequip Ltd or to an authorized TRAILPARTS/CREDO dealer or stockist. Attach your name, address, email address, telephone number, a description of the problem, and a copy of the tax invoice or purchase receipt listing the date of purchase and the TRAILPARTS/CREDO serial number of the defective product.

This warranty does not apply if the product has been damaged by misuse, overloading, impact, modification, improper installation. This warranty is void if any TRAILPARTS/ CREDO serial number has been removed, altered, or defaced.


Please contact the below for warranty service or support:

TRAILPARTS/CREDO
C/ Trailequip Ltd
2 Tuna Street
Dargaville 0310
New Zealand

New Zealand Phone:  0800 487 245
International Phone:   +649 439 5508
Australia Phone:   1300 538 598