Turn Signal to Constant Output for LEDs

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cumminstech

Member - Posts: 4

Joined: May 13, 2019

Location: Ohio, United States

Posted: May 13, 2019 at 6:52 AM / IP Logged

I am building headlights for my 98.5 Dodge Ram 2500. I am trying to use sequential turn signals in the front which require a constant 12v. I have reviewed the pulsed to constant output diagram but am in need of some clarification as to what size diode, capacitor and resistor I will need. How long will the specified diode keep the relay closed?

i am an idiot

Platinum - Posts: 13,667

This member consistently provides reliable information

Joined: September 21, 2006

Location: Louisiana, United States

Posted: May 13, 2019 at 5:33 PM / IP Logged

A bigger capacitor will keep it engaged longer. That diagram as it sits will be a constant output as long as the blinker is sending it's usual pulses.

cumminstech

Member - Posts: 4

Joined: May 13, 2019

Location: Ohio, United States

Posted: May 13, 2019 at 8:46 PM / IP Logged

Ok cool. That’s what I was looking for. Does the type of diode matter? I’m pretty new to more in depth vehicle wiring

geepherder

Platinum - Posts: 3,668

Joined: October 27, 2003

Posted: May 14, 2019 at 7:50 PM / IP Logged

A one amp switching/rectifying diode will be fine.

My ex once told me I have a perfect face for radio.

cumminstech

Member - Posts: 4

Joined: May 13, 2019

Location: Ohio, United States

Posted: May 24, 2019 at 9:23 PM / IP Logged

Got the diode and built my circuit. The diode discharges almost instantly and does not hold the relay closed at all. I am using a typical automotive relay. How big of a capacitor do I need to hold it closed for a second or two? Can I add multiple capacitors together to make the micorfarads I need?

eguru

Copper - Posts: 340

Joined: February 04, 2018

Location: Quebec, Canada

Posted: May 24, 2019 at 9:48 PM / IP Logged

You only need to keep the relay energized for about half a second. Make sure the diode is oriented correctly. You can parallel more capacitors if necessary.

Also a higher resistance coil in a smaller relay may be appropriate - perhaps your relay is larger than required.

i am an idiot

Platinum - Posts: 13,667

Joined: September 21, 2006

Location: Louisiana, United States

Posted: May 25, 2019 at 8:55 AM / IP Logged

What size capacitor did you use? The diagram calls for 10,000 microfarads. Yes you can parallel capacitors to achieve 10,000

cumminstech

Member - Posts: 4

Joined: May 13, 2019

Location: Ohio, United States

Posted: May 27, 2019 at 10:11 AM / IP Logged

Turns out if you have install a 10 microfarad capacitor instead of a 10k microfarad capacitor it won’t work correctly. Thanks for all the help guys. You have been a huge help👍🏻

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