pulsed to pulsed and steady output.

Here is what I'm trying to do. I have a lamp on the side of my Jeep that I want to be off when all lights are off. On when the parking lamps are on, and to flash with the turn signals. I used the Pulsed to Steady Output schematic to base the design on, and modified it slightly. Here is what was come up with. Please take a look, and see if this will work.

You only need the parking light feed to power the light. Use the turn single to open the relay and it will flash oppisite of the turn signal. Parking light in to 87a, 30 to light, turn signal to 86, 85 to ground. So when turn signal is lit side marker will be off and vice versa. As long as the the turn signal and front marker are seperate wires to a 1157,3157 dual filiment bulb, or are seperate all together.

Actually for that you don't need the relay IF the bulb's GND is isolated from the body/panel. Just wire the bulb's -ve/GND wire to the flasher lamp's +ve wire. (Yes, it will flash out of phase except when the parkers are off. The other parkers may come on dimly when flashing with parkers off. That won't happen if the side lamp is a LED.)

Chevys here a common ground here in the US

Gor Blimy Lurch do you get all the wrong lamps coming on as the bloody thing corrodes?
Being behind mid 80s Ford Escorts in the UK with amber indicators was great fun at night.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

No usually just the opposite on the GM's anyway.

lurch228 wrote:

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You only need the parking light feed to power the light. Use the turn single to open the relay and it will flash oppisite of the turn signal. Parking light in to 87a, 30 to light, turn signal to 86, 85 to ground. So when turn signal is lit side marker will be off and vice versa. As long as the the turn signal and front marker are seperate wires to a 1157,3157 dual filiment bulb, or are seperate all together.

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I thought of that, but my concern is that the excessive cycling of the relay would just cause its failure rate vs time to be quite high.

oldspark wrote:

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Actually for that you don't need the relay IF the bulb's GND is isolated from the body/panel. Just wire the bulb's -ve/GND wire to the flasher lamp's +ve wire. (Yes, it will flash out of phase except when the parkers are off. The other parkers may come on dimly when flashing with parkers off. That won't happen if the side lamp is a LED.)

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That how the OEM has it wired. + from parking circuit through lamp, and grounded to the + side of the turn signal circuit. As long as the turn signals aren't lit the side marker grounds through the turn signal bulb filament to allow it to be used as a marker lamp. The the exact opposite when the parking lamps are off for the it to flash as a turn. The problem is if you convert everything to LED that design doesn't work due to the fact that it requires the polarity to flip/flop on the side marker bulb.

Sorry - my bad re my suggestion for a LED indicator. (I don't know why I even suggested it. In another thread I stated that it won't work if it's a LED!!)

But your circuit is correct. You need the parker to be 87a switched else it would be on all the time when flashing...

You don't need the 10k resistor, and 1N400x diodes are fine (1N4004, 1N4007, 1N4001 etc.)


But you may have problems - see pulsed to steady output resistor.
Incidentally, I'm intending similar with my vehicle but I'll be using a PIC (PIC08M2). Apart from its high impedance (low current) input and solving relay chatter problems, it also means it can be bright when flashing, and dimmer for park.


PS - good to see your vehicle also has decent wiring!

You also have the $42 solution which is the DRL-1 module from Daniel Stern's website.
https://www.danielsternlighting.com/tech/markerflash/markerflash.html

lurch228 wrote:

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You only need the parking light feed to power the light. Use the turn single to open the relay and it will flash oppisite of the turn signal.

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Yes but how about when the parking lights are off during daytime? The parking lights won't flash anymore.

Like I said, your diagram is correct. Lurch's wiring isn't - the lamp will be on when the flashers flash off (if the parkers are on).

Other than the out-of-phase wiring for bulbs, the only way to do it is a timed circuit that cuts bulb power from other sources - unless you want to rewire the flasher switch to energise DP relays (ie, before the flasher can); the relays connect the flasher can to the respective bulbs while disconnecting their other sources. (The basic circuit requires 1xSPDT and 1xSPST relay else 1xDPDT relay per side.)