pulsed to steady output

I am using the "Pulsed to steady output" diagram for a vehicle turn signal application and ran in to a small snag. My factory turn signal wire, instead of switching from +12v to open, actually switches from +12v to ground, which discharges the capacitor. Is there a modification I can make to the circuit to prevent this?

Insert a diode

i am an idiot wrote: https://www.the12volt.com/relays/relaydiagram22.html

I am using both diodes just like that diagram. It works if the turn signal just switches from hot to open, but mine switches from hot to ground and when it does it discharges the capacitor and the relay clicks off.

Replace the diode or check that it isn't shorted. It cannot work yet discharge. If the diode is in the wrong direction, the relay won't turn on. If it turns on, the diode won't allow current to return (discharge) to/thru the can side. And that's true even if the circuit does switch to GND {which I doubt - I think you are seeing the other bulb(s); otherwise what's the circuit r flasher can you are using?}. Otherwise check your wiring or that you have a BIG capacitor (electrolytic, not a geencap etc).

10,000 microfarad is the capacitor value in the diagram. Is that what you are using?

I am using a 4k uf cap. It gives me the perfect delay time to keep my relay on without staying on too long. After trying this on the car and it not working correctly, I'm now bench testing the circuit without any load on the relay. If I apply a pulsed positive/open to the circuit, it works perfectly but if I apply a pulsed positive/negative, as soon as the trigger goes to ground the relay opens. I'm not even using a flasher right now. I'm tapping the trigger wire on a constant hot and constant ground wire. As long as I don't tap it on the ground wire it works fine and the relay stays closed until I quit tapping the trigger wire on the constant hot.

In that case your diode is shorted.

It has to be shorted.

Unless the cap is NOT on the line-end of the diode... (I know - the assumption is correct wiring - but just in case...)