So I have bought a pair of LEDs that are connected to a timed delay relay and the signal for it is coming from the cars positive ACC wire. When the ACC gets power, it triggers the relay to turn on the LEDs. When the ACC loses power, the relay deactivates after 15 seconds (hence the delay relay)

But now, what I want is that when I unlock the car, that also acts as a trigger and turn on the led. I already know where I'm going to get the positive wire for that so that isn't a problem. The problem is how I'll connect it and make it all work.
Like I could simply connect the trigger wire for unlocking with ACC and call it a day. But that'll probably short something and burn the car.

So there must be some other relay or device that I could use which keeps both ignition and unlocking wires disconnected and sends signal from one or the other depending on which one has power.

I am pretty noob at this kinda stuff so please bear with me.

 

Use two diodes.

 

Thank you for your reply. I have just two questions.
Will this be able to handle 12volts and what would happen when both inputs have current.

 

No problem with 12 volts.
The diodes provide isolation between the two inputs so there isn't any interaction.

 

Great, that was quite helpful.
So can I connect more than two diodes considering I want there to be more than two signal wires, each from a different source.

 

Great, that was quite helpful.
So can I connect more than two diodes considering I want there to be more than two signal wires, each from a different source.

Yes. Remember the relay stays activated until last input is disconnected.

 

Thank you for your help. Much appreciated!

 

Use two diodes.
View attachment 260620

An offshoot question.
How can I replace the diodes with FET's in this setup? I have seen FET's used in Reverse Polarity Protection but not for this configuration.
Tks.

 

An offshoot question.
How can I replace the diodes with FET's in this setup? I have seen FET's used in Reverse Polarity Protection but not for this configuration.
Tks.

Why would you want to when a diode is all you need.
Not sure if I'm following you correctly, can you elaborate on this?

 

Why would you want to when a diode is all you need.
Not sure if I'm following you correctly, can you elaborate on this?

I was looking at using FET's as a Diode due to lower voltage drops.

 

Can I use 1n4007 diode instead of 1n4002 for this project?

 

Yes you can.

 

So what I have read on the internet, the 1n400x diodes are rated for max 1A. Is that suitable for my use or should I get a volt meter and check the amperage from the wires.
Considering the it is greater than 1A, what should I do?

 

Considering the it is greater than 1A, what should I do?

It's probably not more then a few milliamps. Can you post a link to your time delayed relay module?

 

https://a.aliexpress.com/_m0rxYPK
here it is

 

here it is

They don't give the specs for the trigger current however from looking at the board I would estimate about 10ma with a 12 volt trigger supply. If you want you can verify that with a multimeter. Do you know how to do that ?

 

I don't have a multimeter however I can ask someone to check it for me.

 

Only if you are curious. You won't have any issues with a 1 amp diode.

 

https://a.aliexpress.com/_mq7ZW2s
This is the led bulb that I'm using. The amber part is connected to the factory turn signal plug, however, the white led will be getting power from the relay which will be getting power straight from the car battery.
Could you please tell me what amp fuse should I use for the white leds. They draw 12v 0.5A according to manufacturer.

 

Alright thanks. I was somewhat confused with that. Google does that to you lel