I am looking for a little wiring help for this idea I am kicking around. I am thinking about making a pair of amber fog lights flash with my turn signals. I think the concept is straight forward when the fogs are not switched on. If I use (2) separate relays and send the turn signal power to the relay input 86, that can signal that dedicated lamp to flash either left or right. I think I would need a few diodes from back feeding the other side. Is it possible to make one or the other flash when they are powered on via the toggle switch? VOH
If you use the fog lights as running lights, one whenever the ignition is on, you can do it pretty simple. Wire the lights direct from the ignition, you can use a relay if you want. Then wire two relays, two contact relays, one to each fog light ground through pins 87a and 30. Wire the turn signal outputs to pin 85 with pin 86 grounded. That way when the turn signal activates the relay it breaks the ground to one light. Since the TS switch output is intermittent the ground gets broken then restored causing the normally on light to flash.
In the first sentence the "one whenever the ignition is on" should read "on whenever the ignition is on"
If you want to be able to turn the fog lights on and off, it becomes more complicated but doable. I'll have to ponder on it awhile.
By the way, on your schematic you have the turn signal output going directly to ground through the toggle switch. I don't know why there is a ground at the toggle.
been saving this as this is how GM does it and fronts will blink out of time with taillights Summary This procedure will enable the front side marker lights of any car to blink _with_ the turn signals (if running lights are off) or to _alternate_ with the turn signals (if running lights are on). Normal operation of the marker lights is not affected. The procedure works on any car with parking and turn signal lamps at the front, even if the turn signals are not dual-filament (#1157/1157A/1157NA) bulbs, such as on Japanese cars. Restrictions The marker lamps must not be single-wire designs which rely on the car body for grounding. If the marker lamp has two wires connected (power & ground), the procedure will work. History This wiring alteration reproduces the standard design first used (and presumably patented) by General Motors in 1971. A similar approach was used by Ford for one year in 1970, but that design blinked both front and rear markers and was apparently abandoned after the 1970 production cycle. Following the apparent expiration of the patent in 1986 or there- abouts, other manufacturers began to also use this wiring scheme. Basic Design Premise Wiring to the marker lamp is rearranged such that the lamp bridges the parking and turn signal circuits, drawing power from whichever circuit is "hot" and grounding through whichever circuit is dead. Tools Required 12V test light with needle probe Soldering iron or 3M Quicksplice connectors, or equivalent Short length of 14-gauge stranded wire (possibly) Instructions The whole job involves only re-routing one wire on each side. You just need to check carefully to ensure that you've identified the right ones. 1) Switch on the vehicle's parking lights and 4-way emergency flashers. You don't need to run the engine during this test unless the battery is severely low. 2) Using the test light on the wiring going into each turn signal, identify the wire carrying the blinking turn-signal power. 3) Using the test light on the wiring going into each front side marker lamp, identify the ground wire (the one that's _not_ hot). 4) Switch the vehicle lights off. You don't need to disconnect the battery. 5) In the next step, you're going to snip the ground wire coming from the marker lamp and connect that wire to the turn signal's power feed. Work out the best way to snake the marker lamp ground wire around to a point where you can tap it into the turn signal's power feed wire, using an extension of 14-gauge wire if necessary. Pay attention to what cavities or openings might be filled when you reinstall the light ***emblies, if you removed them previously. You don't want to pinch the rerouted wires. Note: Don't get confused here. The idea is to run the ground wire FROM the marker lamp TO the turn signal. Currently it runs from the marker lamp into the wiring harness and grounds somewhere. You're _not_ trying to connect the harness ground to the turn signal! 6) Cut the ground wire coming from the marker lamp, giving yourself as much wire length as possible from the marker lamp to the cut point. Tape the cut end of the ground wire that goes into the vehicle harness and stuff it out of the way. 7) Connect the ground wire leading from the marker lamp to the hot lead going to the turn signal on that side. Tape or otherwise weatherproof the connection, and you're done. Notes: 1) To tap into the turn signal's hot lead, you can melt a short length of the insulation with the soldering iron, let cool, then pull the melted insulation off with your fingers. Wrap the ground lead from the marker lamp around the exposed wires, solder properly and tape up. Try to only use the Quicksplice connectors if space is a problem. Ground from Marker Lamp ===\ \ Wiring harness <============-\/\/\/\/-======> To front turn signal ^^^^^^^^ wrap & solder here 2) Most markers use a little #194 or #194A bulb. These have a lot of work to do when operating with turn signals, so pop in new ones at this time. Wipe Vaseline on the base contacts for good connections. Andrew C. Green (312) 266-4431 Frame Technology Corporation Advanced Product Services 441 W. Huron Internet: acg@frame.com Chicago, IL 60610-3498 FAX: (312) 266-4473
1- Left from signal switch 2- Right from signal switch 3- Left fog light 4- Right fog light 5 & 6- power from fog light on/off switch.
The experts may prove me wrong but I would believe that placing a diode in each side of the wiring from the "fog light switch" to the fog lights would prevent power from feediing back from one light to the other or you could use two toggle switches = one for each light. That might be the simplest if you have the fog light switch on a panel under the dash.
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