1 Introduction

This is a step by step procedure on how to rewire a US spec Starion/Conquest in order to use the Euro/JDM tail lights. Both sets of lights have the same style of 6-pin connector and are interchangeable. The only difference is that the US spec lights only use 4 of the 6 pins while the Euro/JDM lights use all 6 pins. Cosmetically, the major difference is the separation of the turn indicators to their own amber lenses vs the US style integrated brake/turn/hazards in the red lenses. Electrically, they both have the same 4 pins in common. Pins 2, 4, 5, 6 are electrically the same on both lights at the connectors but wiring varies slightly inside the tail lights. The Euro/JDM lights have only one bulb in each light dedicated as a brake light and pins 1 & 3 are not used by the US spec lights, but used on the Euro/JDM lights.

The mod will consist of 3 major steps :

  1. Rewire the Euro/JDM lights to add another brake light
  2. Add a new brake and running light circuit to pins 1 & 3 respectively to the OEM harness
  3. Tie the new brake circuit into the 3rd brake light and electrically separate the integrated Brake/Turn/Hazard circuit from the OEM harness

The mod is not difficult and can be done in a few hours with minimal impact to the stock setup should the need arise to go back to US spec lights.





2 Materials
  • Euro/JDM tail lights
  • 6ft- 14AWG stranded primary wire (blue)
  • 1ft- 16AWG stranded primary wire (green)
  • 2- Double contact pigtails
  • 2- 22-18 gauge tap splices
  • 2- 16-14 gauge tap splices
  • 2- 22-18 gauge insulated butt connectors
  • 4- 22-18 female spade connectors (noninsulated)
  • Soldering iron/solder
  • 6" 1/4" dia. heat shrink tubing
  • 60" 1/4" dia. expandable sleeving
  • Wire labels
  • Wire strippers
  • Terminal crimper
  • #2 Philips screw driver
  • 10mm socket/ratchet


3 Rewiring the Tail Light Assemblies

3.1 This first thing that will be needed to be done is to modify the wiring on the JDM lights. Only one of the brake lamp sockets is wired as a dual filament (1157) allowing it to function as a Running and Brake lamp. The socket in the middle has an 1157 bulb but the pigtail connector only has one lead, making it act as if it were a single filament "1156" bulb and only serves as a Running light. Figures 1 and 1a show the bulb types and the 6-pin connector pinout. Figure 2 shows a close up of the two main bulbs and the difference in the socket wiring. (The example shown is for the left light assembly).


Figure 1 (Left Light )



Figure 1a

3.2 Wiring Code

  • R- Red
  • RL- Red w/blue stripe
  • B- Black
  • G- Green
  • Gw- Green w/white stripe
  • GL- Green w/blue stripe
  • Wr- White w/red stripe
  • Wg- White w/green stripe
  • Wx- White w/ stripe dependent on left or right side



Figure 2 (Note: Both bulbs and sockets are actually 1157 style.)


3.3 In order for both bulbs to function as both Running and Brake lamps, the single contact pigtail on the middle bulb socket will need to be changed to a double contact 1157. 1157 double contact pigtails can be obtained at your local autoparts store. Figure 3 is a representation of typical 1157 double contact pigtails.


Figure 3


3.4 To remove the existing pigtail, use wire cutters to cut the single wire about midway between the socket and 6 pin connector (Figure 4). After the wire has been cut, the pigtail can be removed by using a small flat tip screw driver to apply pressure on the side opposite of the tab. This will cause the tab to pull away and out from the slot at an angle releasing the contact plate. This will allow the pigtail to be removed by sliding it out from the bulb side of the socket (Figure 5).


Figure 4



Figure 5


3.5 Insert the new pigtail into the socket. The contact base needs to go in at an angle and the tab should line up with the slot (Figure 6). Once the tab is in place, pressure can be released and the connector base will stay in the socket (Figure 7).


Figure 6



Figure 7


3.6 The next step is critical. The proper filament needs to be identified and the proper wire labeled to ensure the tail lights illuminate properly. Re-install the bulb and place the new pigtail assembly next to the OEM 1157. Orient the two assemblies so the proper bulb pins line up to each other. Note the wire designations. In this case, there is a green (G) wire and a green wire with a white stripe (Gw). Once the proper orientation has been determined, mark the corresponding wire on the new pigtail with a wire label as 6 (Figure 8).


Figure 8


3.7 Once the new pigtail has been installed and the wire labeled, it can be placed back in the lamp holder. The wires coming from the new pigtail will need to be trimmed. Cut both wires approximately 2" from the socket (Figure 9).


Figure 9


3.8 Using wire strippers for 16 gauge stranded wire, strip 1/4" of insulation from the OEM Gw wire and the newly labeled wire on the socket side. Do not strip any insulation from the other wire coming from the socket (Figure 10).


Figure 10


3.9 Using a 22-18 gauge tap splice, splice the non-labeled wire coming from the socket to the solid green (G) wire that goes to the other 1157 socket (Figure 11).


Figure 11


3.10 Next, cut a 1.5" segment of 1/4" dia. heat shrink to and slide it on one side of the stripped Gw/6 wires. Using connector crimpers, crimp a 22-18 gauge insulated butt connector to one of the Gw wires (Figure 12).


Figure 12


3.11 Next, slide the other Gw wire into the butt connector and crimp the wire into connector. Slide the heat shrink tubing over the butt connector so there an even amount of overhang on either side. Use a heat gun and shrink the tubing. When complete, the final assembly should look like Figure 13.


Figure 13


3.12 Carefully tuck the wires back in. Ensure the wires going to the Turn Indicator are routed through the slit (Figure 14). Replace the cover back onto the tail light assembly. Ensure no wires are pinched and that the cover snaps into place (Figure 15).


Figure 14


Figure 15


3.13 Repeat the procedures for the other tail light assembly. Continued on next page...

[Go to JDM Tail Lights Page 2]


[Cargo Area Lighting] [LED Evaluations] [Instrument Cluster Lighting]

[Interior Lighting] [Project Starion Home]