Euro Style LED DRLs - Design, Concept, Circuit - All Cars

[jose456891]

My 1996 850 is a beast! It smokes most newer cars off the highway with its sheer speed and handleing. One thing I wish my car had that newer cars have is LED DRL (LED Daylight Running Lights)

Here is a schematic of a circuit controlling their function. This circuit will even allow the LEDs to blink opposite to the turn signals. If the right turn signal turns on, the right LED DRL will go off.

Materials needed: (BASIC LIST)

1x 12V 20amp SPST Switch (S2)
1x 12V 20amp SPST Relay (RY1)
2x 12V 20map SPDT Relays (RY2, RY3)
2x 12V LED Strips (L1, L2, L3 [Opt], L4 [Opt])
1x 4 Meter Red wire (+ circuilt)
1x 4 Meter Black wire (- circuit)
1x Common electronic tools (Solder, Soldering iron, terminals, wire stripper, volt meter, etc)
1x BRAIN!!!!

This circuit is a mere guide, feel free to add or subtract items from this circuit. Also RY2 and RY3 have one unused pin each that will energyze when the turn signal powers on. Each mirror can be fitted with LEDs and be controlled with this circuit. The controlling SPDT relays will make these LEDs behave the same way as the turn lights.

By using this circuit you are agreeing to the GNU v3.0 licence. This means that you may use it as you see fit and modify, and use at your own risk. http://www.gnu.org/licenses/gpl.html

Brought to you by: Jose456891

Published on: https://www.matthewsvolvosite.com/
September 12, 2013

PNG Circuit Diagram

[jose456891]

Sourcing Materials:

I found out that in the US Radio shack will not have all the necessary components. They do have good soldering kit, colored wire, strippers, SPST switches, project boxes and terminals.

The best place to get the rest of the materials is (in my opinion) eBay

LEDs:
http://www.ebay.com/itm/SPECIAL-OFFER-S ... 5d3f41be78

Relay SPST:
http://www.ebay.com/itm/Universal-12V-4 ... f4&vxp=mtr

Relays SPDT:
http://www.ebay.com/itm/12-V-30-40-AMP- ... 37&vxp=mtr


If you buy greater quantities (5 SPDT) you can save a bundle, and then use a SPDT instead of a SPST for RY1.
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Tapping into the turn signal:

Each of our turn signals has a compound bulb two filaments. These filaments are attached to a wire that is positively energized with 12v when the turn signal is activated. To get the turn signal and not upset it's fail mechanism we must use a way to minimally alter its circuit resistance. This is done in my schematic by using two relays (one for each turn signal, R and L).

I believe that the turn signal originates from the hazard light switch. I think the color of those wires Blue for left and Green for right or the reverse.

You may also tap onto the turn signal connector it self.

I would recommend grounding the LEDs to the negative battery post, because the LEDs are sensitive to voltage. However, the relays can all be grounded to the chassis. They don't care if there is too much resistance in the negative path.