starter button relay.

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12v nut

Member - Posts: 20

Joined: September 12, 2004

Location: United Kingdom

Posted: April 30, 2007 at 3:22 PM / IP Logged

HI all!

I've just completed a starter button mod in my 2002 E47 M3.

I used the Honda switch from an S200, looks great!

trouble is when the ignition is on (driving) its possible to accidentaly press the button and its still active, is there a way to wire a relay to make the button inactive while the engine is running by possibly adding a second relay?

My wiring is........12v swiched live to pin 30, wire out to starter, pin 87,push button switch ,pin 86, ground and button ground to pin 85.

Thanks guys.

dualsport

Silver - Posts: 983

Joined: September 27, 2005

Location: United States

Posted: April 30, 2007 at 11:59 PM / IP Logged

Probably other ways to do it, but here's one way to do it-

If you try this, you need an added connection to the starter terminal or relay (you can use the connection from your existing relay going to the starter), which is used by the circuit to act as a ground for the relay coil. This way, the bottom relay latches on only after you release the starter button, opening up the connection for your starter button, and preventing you from hitting it a second time. Turning off the ignition resets it and allows you to crank again.

12v nut

Member - Posts: 20

Joined: September 12, 2004

Location: United Kingdom

Posted: May 01, 2007 at 2:55 PM / IP Logged

Thanks, will give this a try.

hotwaterwizard

Silver - Posts: 1,350

Joined: December 11, 2003

Location: California, United States

Posted: May 01, 2007 at 9:13 PM / IP Logged

What kind of voltage Regulator do you have on your Engine?

On a Hot Water Pressure washer we just tap into the wires of the coil before it goes to the Regulator.

Then hook a Bridge Rectifier across the wires and use a 24vdc relay to allow the burner to come on only when the Engine is running.

We could use the same relay to prevent something from comming on by swapping one pin on the relay.

starter button relay. -- posted image.

John DeRosa (Hotwaterwizard)

Stockton California

When in doubt, try it out !

hotwaterwizard

Silver - Posts: 1,350

Joined: December 11, 2003

Location: California, United States

Posted: May 02, 2007 at 8:39 AM / IP Logged

John DeRosa (Hotwaterwizard)

Stockton California

When in doubt, try it out !

12v nut

Member - Posts: 20

Joined: September 12, 2004

Location: United Kingdom

Posted: May 02, 2007 at 1:32 PM / IP Logged

hanks, but a little technical for me starter button relay. -- posted image.

I found this starter button relay. -- posted image.

Look OK?

hotwaterwizard

Silver - Posts: 1,350

Joined: December 11, 2003

Location: California, United States

Posted: May 02, 2007 at 8:26 PM / IP Logged

I rearanged the wires so it would be easier to understand. I have another Idea I am working on it would be better to wait before you do any wiring.

starter button relay. -- posted image.

John DeRosa (Hotwaterwizard)

Stockton California

When in doubt, try it out !

dualsport

Silver - Posts: 983

Joined: September 27, 2005

Location: United States

Posted: May 02, 2007 at 8:48 PM / IP Logged

That's much easier to read, but I still don't know what that circuit is supposed to do- relay #1 is used as a starter relay, and relay #2 opens up the connection between Ignition & BLACK / YELLOW wire while cranking only. Only use I can figure for it would be to open up power to accessories during cranking; is that the idea?

Bunch of questions-

Why is there a 20A fuse for the coil of the No. 2 relay? Unless that's one humongous relay, all it needs is a fraction of an amp. (?)

What is the pushbutton doing with the ground connection? 5A power from the IG ON/START +12V?

hotwaterwizard

Silver - Posts: 1,350

Joined: December 11, 2003

Location: California, United States

Posted: May 02, 2007 at 11:02 PM / IP Logged

John DeRosa (Hotwaterwizard)

Stockton California

When in doubt, try it out !

hotwaterwizard

Silver - Posts: 1,350

Joined: December 11, 2003

Location: California, United States

Posted: May 02, 2007 at 11:16 PM / IP Logged

When the Alternator is putting out power it turns on the relay the normally closed contact opens and stops the power to the switch.

John DeRosa (Hotwaterwizard)

Stockton California

When in doubt, try it out !

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