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Look at info at end of article on using sales code to eliminate need for resistors on 2010 and beyond Ram trucks.

Modifying the exterior lighting of the Ram truck starting with 2006 Model Year
The Ram truck has been designed and developed using standard incandescent lights. These lights are controlled by a computerized module called the “Totally Integrated Power Module” (TIPM).
This module controls the left front, right front, left rear and right rear lighting independently. The TIPM utilizes “smart” technology that has the ability to monitor the current (amp) on some of the lighting outputs. These monitored outputs include the headlamps, turn lamps, stop lamps and reverse lamps. The module is able to detect both electrical short and open circuit conditions. The module has a preset allowable current (amp) operating range for each of these outputs. If while in normal operation the current detected falls outside this preset range, then a fault is set in the module. In the case of too high of current the circuit will be shut off. This fault condition will remain true until the current level falls back into the normal range. In the case of the turn lamp circuits, if the module detects too low of current then the module will assume an open circuit condition (burned out bulb) and the blinker will flash at a double flash rate.

This detection is in place to assist the customer in determining if there is an active short in the lighting circuit or a burned out bulb (open circuit).

You can also get into these fault conditions by adding additional lamps to the circuits or by changing the lamp specifications (i.e. changing the type of lamp used). This would include, but is not limited to, the use of L.E.D.’s. By using them you run the risk of causing lighting faults or loss of lighting functionality.

The question then becomes, “can you use L.E.D. lighting on the 2006 and beyond
Ram trucks”? The answer is yes, but special care and procedures need to be followed to use L.E.D.s successfully.

Use of L.E.D. lamps in conjunction with the original equipment incandescent lamps:

If you are keeping the original incandescent lamps (or the aftermarket equivalent) and you want to add additional L.E.D. lamps for use as stop, turn, reverse or park lamp function you can do so with no additional changes to the vehicle or its electrical system.

Use of L.E.D. lamps without the original equipment incandescent lamps (2007-2009):

In order to use L.E.D. lamps in place of the original incandescent lamps you must use a resistor that matches the original lamps resistance. For the stop/turn function on the 2007/2009 Ram truck that would be a 6ohm resistor wired in PARALLEL with the L.E.D. lamps. A 6 ohm resistor matches our OEM bulbs. However it is recommended that a 1000 ohms 1 watt resistor be used so that the amperage draw is minimized. It should be capable of surviving exterior exposure on the vehicle with consideration for vibration and expected life cycle. As power resistors get hot under normal operation it is suggested that they be placed in an area with adequate ventilation and heat dissipation. It is further suggested that the resistor be located very near the L.E.D. lamp. This is to help with any future service related maintenance or repairs to the lighting circuits or lamps.

2010 and beyond

Alternatively for 2010 and forward, the Ram dealer has the ability to turn “off” bulb out detection for the rear stop & turn lamps. This is accomplished by having a Dealer add the sales code “LBQ” to the vehicle configuration file in the TIPM module. By doing so you will not need to add any resistors to the lighting circuits to prevent a fast flash or lamp out warning.
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