wiring a solid state relay

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9c1bbody

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Joined: November 18, 2008

Location: Illinois, United States

Posted: November 20, 2008 at 8:11 AM / IP Logged

this is my demo, show, family vacation, drag strip and soon to be road course car

I sell/install new and used police cars and equipment

my web site is vetoenterprises.com

bbody

Member - Posts: 12

Joined: June 15, 2005

Location: United States

Posted: March 22, 2009 at 2:18 AM / IP Logged

I've finally started the project

but I have a problem the leds have a glow to them

it happens when I have positive to either pin 8 or 6

does anyone have any ideas

Thanks :)

Installer

i am an idiot

Platinum - Posts: 13,674

This member consistently provides reliable information

Joined: September 21, 2006

Location: Louisiana, United States

Posted: March 22, 2009 at 2:34 AM / IP Logged

KPierson wrote:

Connect Pin 8 to positive voltage (either straight battery power or ignition depending on if you want the LEDs to work when the car is off.

Connect Pin 7 to your (-) trigger to turn the LEDs on.

Connect Pin 4 to positive voltage (again, like above either battery or ignition depending on your requirements).

Connect Pin 6 to the + side of your LED and then ground the other side of the LED.

That should get it working.

Re-read the above. Pin 6 does not have positive voltage connected to it, it should have the positive side of the LED connected there. The positive voltage connects to pin 4.

bbody

Member - Posts: 12

Joined: June 15, 2005

Location: United States

Posted: March 22, 2009 at 2:46 AM / IP Logged

I'm sorry I meant 4 and 8

Installer

KPierson

Platinum - Posts: 3,527

Joined: April 14, 2005

Location: Ohio, United States

Posted: March 22, 2009 at 10:10 AM / IP Logged

Solid state relays can have "leakage current" when they are not on. The way to get away from it is to put enough current on the relay to actually clamp it down and shut it off. Try wiring a standard automotive relay in parallel with the LEDs just to verify that the extra current will cause the relay to turn off.

If that is the problem you may want to shop around for different brands of SSRs - some will work better then others.

Kevin Pierson

bbody

Member - Posts: 12

Joined: June 15, 2005

Location: United States

Posted: March 22, 2009 at 3:03 PM / IP Logged

So if I understand correctly if I have a higher load/amp draw these relays will not leak and shut off 100% right?

If that's right what type of resistors do you think I need to add?

Installer

bbody

Member - Posts: 12

Joined: June 15, 2005

Location: United States

Posted: March 22, 2009 at 3:43 PM / IP Logged

So I had different leds that I was testing with that had this issue...

I just tried the leds that are going into the tail lights and they do not have this issue. I will throw a meter on the ss relays to make sure they are 100% off.

Thanks KPierson :)

Installer

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wiring a solid state relay

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