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LED dummy loads

Most common REDARC LED dummy loads

 

There is no single answer for what dummy load to use when vehicle or trailer lights have been replaced with LEDs. Below are a few scenarios encountered:

 

 

Problem:


LED trailer lights flicker when connected to REDARC 24-12V trailer lighting reducer.

 

Cause:


The LEDs don't draw enough current to allow the trailer lighting reducer to operate properly.

 

Solution:


Fit REDARC adaptor ACL4 (for 4 circuit LEDs) or ACL5 (for 5 circuit LEDs).

 

 

Problem:


LED trailer lights flash or cause "Trailer lamp fail" (or similar) warnings on the dash. (Applies to factory fitted trailer socket)

 

Cause:


LEDs don't draw as much current as the original trailer lamps. This causes the trailer light driving circuit to cycle on/off or the lighting control unit (LCU) to report a trailer lamp failure.

 

Solution:


Fit a REDARC LDLIBT12 (or 24 for 24V application) to the trailer. LDLIBT means Led Dummy Load Indicator Brake Tail (it applies 21W to each indicator, 42W to brake lights & 10W to tail light circuit).

 

 

Problem:


Filament lights on the back of a vehicle have been replaced with LEDs, now there is "Lamp fail" (or similar) warning on the dash.

 

Cause:


The LEDs don't draw as much current as the original lamps. This fools the lighting control unit (LCU) into detecting a lamp failure.

 

Solution:


Fit a REDARC LDLIBT product suitable for your vehicle. The equivalent load required to stop the LCU detecting a fault varies from vehicle to vehicle, depending on the number of filament lamps being detected. Determine the number and wattage of filament lamps in the original vehicle lighting before contacting REDARC for a suitable product.


LDLIBT means Led Dummy Load Indicator Brake Tail (it applies load to all circuits).

 

 

Problem:


Standard filament lights on the back of a vehicle have been replaced with LEDs, now the indicator flashes too quickly.

 

Cause:


The LEDs do not draw enough current to make the flasher can run at the correct rate. This is the same as what happens in a normal vehicle when an indicator lamp fails.

 

Solution:


Fit REDARC LDLI21-12 (or -24 for a 24V vehicle).


LDLI21-12 means Led Dummy Load Indicator 21W, 12V (as it only applies load to the indicator circuit)

 

 

Problem:

 

LED trailer lights cause incorrect operation of ABS.

 

Cause:


The ABS monitors the trailer lighting output from the truck. If it detects that a trailer is connected (by the load of the filament lamps), the braking profile is adjusted for a trailer. LEDs do not draw enough current and this is seen as "no trailer" by the ABS and brakes operate as if there was no trailer.

 

Solution:


Fit a REDARC LDLB product to the trailer, LDLB12 (or 24 for a 24V trailer).


LDLB means Led Dummy Load Brake.

 

 

Problem:


LED indicator lamps stay on dimly between flashes.

 

Cause:


Flasher can output voltage (designed for filament lights) does no drop low enough between flashes for LED to switch off

 

Solution:


Possible solution is to fit a REDARC LDLI21-12 (or -24 for a 24V vehicle).


LDLI21-12 means Led Dummy Load Indicator 21W, 12V (as it only applies load to the indicator circuit).

 

 

Problem:


Trailer lights (filament or LED) wired parallel with vehicle rear lights cause lighting overload indication on LCU.

 

Cause:


Extra load caused by extra lamps on indicator/brake/tail light circuits.

 

Solution:


Fit a REDARC C12-4 (or C24-4 for 24V application). It allows vehicle lights to operate relays that switch battery power to trailer lights.