Flashing LED Side Markers / Parking lights [S13]

ONLY for ADVANCED technical discussion about the 240sx!
jklein
Posts: 2
Joined: Thu Oct 03, 2013 3:07 pm
Car: 1990 240sx

Post

1989 - 1994 240SX
Description of LED Side Marker Signaling

Problem an LED is a polarity sensitive light it must receive the current on the positive lead. If you hook it up backward, it does not light. In the old days, we could change one wire and have the incandescent side markers flash when the turn signals were flashing. The current was flowing in the reverse direction when the side markers where turned on.

Chart 1 shows an overall diagram of wiring of my circuit to the car’s signaling system. Please note the LH and the RH are separate components for the left and right turn functions. Also, that each the LH and RH are made up of two micro relay switches each.


Image

. Chart 2 shows LH and LR grouped together because they share many of the same lines and this reduces external wiring.
Image
Chart 3 shows the wiring of either the left or right signal.
Use Chart 3 to follow the description below:
Image

We are wiring #2 Relay the Flashing Unit, to a default of: Side Markers OFF switching to ON.
Therefore, #2 Relay’s N/O has the power, #2 Relay’s N/C has no power

The #1 Relay is the current flipper.
When #1 Relay is not active.
Power flows from line 4 to the center post then out #1 Relay’s N/C into #2 Relay’s N/O. When #2 Relay is activated by the pulsing turn signal Line 2 or 3 it flashes the side marker from OFF to ON.

When the parking lights turn on line 1.
#1 Relay’s becomes active.
#1 Relay flips power from line 4 to the center post then out #1 Relay’s N/O into #2 Relay’s N/C. The side markers are now illuminated.
When #2 Relay is activated by the pulsing turn signal Line 2 or 3 it flashes the side marker from ON to OFF.
Image

Chart 2 shows the wiring of the LH and LR (4 relay switches) fit together how they interconnect and how they share some common lines.

The Component for this project:
Soldering gun solder and optional plastic wire splices.
4 pieces of 12V SPDT 5 Pin Mini Power Relay JQC-3F (T73), Coil Voltage: DC 12V; Contact DC28V 10A. Size (Approx.): L 19mm x W 15.5mm x H 15.5mm
(3/4” x 5/8” x 5/8”)
14 or 16 gauge different color wires.
Wire stripper and small pliers.
One sheet metal screw.

Assembly Notes:
I selected micro components because they cover the amp and voltage requirements and do not take up the room of standard car relays.
Try to use many colors so as not to get confused.
Use chart 2 as your primary guide, although all three charts have the same line numbering. Write a color chart to identify each of the seven lines.
These micro relays are not sensitive to polarity just follow the chart and you will be successful.
The bottom of the JQC-3F (T73) micro relay looks exactly like the relays in charts 2 and 3.
I am wiring front and rear side markers.
Cut all the four positive lines at the Side Markers, Leave enough line to work with. Tape up three of the four cut switch side (+) lines.
Line 1: Use one of the switch side cut (+) lines and connect to line 1. This is used to know when the Side Markers are turned on.
Line 6 LH and Line 7 RH: These are the new flashing lines for the left and right side markers. Theses are connected to the Side Markers end of the cut (+) wires. Run a splice off the 6 and 7 lines to control the rear side markers.
Line 2 LH and line 3 RH. These lines tap into the front or rear direction signal lights. The front wires are green/yellow. The rear direction signals have only two wires so it is the non black.
Line 4 supplies power to the Side Markers. It requires connection to an always hot line. That means when the key is out of the ignition and the doors are closed this line always has current. Insuring this connection will allow all Side Markers to flash whenever the hazard lights are active.
Line 5 is the ground. A short lead can be attached to any close body panel with a self taping. Sheet metal screw.

I am using a seven day pill reminder case to place the micro components into. I am cutting off one day and using the 6 even compartments. From left to right compartment 1=empty screw in bottom to attach case, 2= LH Relay 1, 3=LH Relay 2, 4= RH Relay 1, 5 =RH Relay 2 and 6= empty screw in bottom to attach case. Some of the slots between compartments will be removed to allow interconnection. Seven holes on various ends to allow exiting of the lines.


Return to “240SX Technical Forum”