Hey guys I had a quick question for anyone running on S300 and using a switch to jump between their Hi/Low boost maps. I would like to use a LED lighted switch to ensure I know which map I am on. But with most, or all of the inputs needing a GROUND signal how could I wire it to make the LED light up when activated?

Thanks for help in advance.

 

well you can use a relay to convert a positive signal to negative and vice versa

 

any chance you could draw me a diagram? haha wiring is not my forte.

 

kinda hard to explain, actually I think you can do it without a relay the led needs both power and ground anyways so hardwire the led to power and use a switched ground via toggle shared with the s300 and the LED

So when the toggle is switched on it provides a ground to both the led and the S300, make sure to used a fused circuit on the positive portion of teh led, which is not shown in the diagram (easier to tap into a circuit near the fusebox that is only giving power when the ignition is switched on)

 

makes sense like that but the led is built into the switch itself which is what is confusing me. I think I may need the relay like you mentioned originally

 

Note this utilizes an external LED separate from the switch, if you really want a LED toggle switch that uses the built in LED you will need to use a relay for that I can get you the info but it will be slightly more complicated then what I have already shown.

 

Okay to use the built in LED we will need a relay, a relay is basically a switch that activates when you give it power

The led toggle should have both a power and a ground input and one output which will be the positive.

So the relay is just a switch, when it receives power (both positive and negative) it will activate the switch. I have included an extra picture which details relay pinouts

pin30 (common) this is the input of your switch
pin85 (coil ground) this is the switch negative connection
pin86 (coil battery) this is the switch positive connection
pin87 (normally open) this is the output of your switch, we want normally open so that it only activates when we have the toggle switch "on"
pin87A (normally closed) we wont be using this, if we did it would give the s300 the inverse signal of what we are trying to achieve

 

Now when we flip the toggle it activates the relay connecting pins 30 (common) which in our case is the ground signal, to pin 87 which we have connected to the s300

pins 85 and 86 are a (coil) which is just an electro magnet and flips the switch to connect pin 30 to pin 87 (these only get both power connections when you flip your toggle "on")

 

Awesome!! thank you so much for your help!! I appreciate that very much man.

 

No problem, happy to help. Wiring is easy peezy, just a game of connect the dots lol

 

I'm using an led rocker to ground the SCS signal on my ecu and it works just fine without a relay... I use the input to activate onboard logging in NepTune, it will be the same process to switch maps with your s300. There is just enough current on the line, when grounded, to fire the led and light the switch. Using a relay massively overcomplicates things, in this application.

 

So how would I wire that? Run the ecu wire to where the 12v power would go? and ground the other two poles on the switch?

 

Depends on the switch, I don't know what you're working with and which input you've chosen to use. In the case of a rocker it would likely be ground side to the middle pole of the switch and ecu side to the pin of the rocker that is closest to the led you want to light. There should be a diagram on the package of the switch you bought. What does it say?

 

It is an LED rocker. The pole closest the led says (earth) the middle one says (load) and the bottom one opposite the led says (source).

 

Okay. That's opposite of what I expected, but try hooking it up this way: ECU side to the "source" pin and ground side to the "earth" pin. If that doesn't work, move your ecu wire from the source pin to the load pin, but i suspect that the first configuration will work fine. All you're trying to do is to ground the ecu pin via the switch, this is a safe hookup to play around with. What input are you trying to use?

 

I have it set to D6 on the ecu. My tuner set it up that way. I followed how you stated to wire it in.. the LED lights up running to D6. Should I assume that it is grounding correctly as long as the light is on? Also do you know if there is a way to confirm in Smanager if it is switching maps?

 

It wouldn't light up if it wasn't grounding. I'm not 100% up to date with sManager but you should be able to see it in logging somewhere.

 

Yup tested it out on the street. It works fine. Thanks for all your advice and help!!!

 

For sure, you're welcome. Enjoy