starter kill with ebrake on

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Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=99323
Printed Date: June 23, 2025 at 10:22 AM

Topic: starter kill with ebrake on

Posted By: americasfuture
Subject: starter kill with ebrake on
Date Posted: November 24, 2007 at 11:16 PM

i want to make my blazer not start unless the ebrake is on. its probab;y very simple to do, but i am probably nuking it. i was thinking of using a relay to have the starter killed unless the ebrake is on. but im not sure how exactly to do this. a normally open relay? but of the ebrake was set sending voltage to that relay keeping it closed, wouldnt that put a drain on the battery?

Replies:

Posted By: techman93
Date Posted: November 24, 2007 at 11:33 PM

If the Emergency brake is 12v+ then you can use it to trigger a relay to go open with key.

If the Emergency brake wire is 12v-

pin 85 to ignition 12v+
pin 85 to 12v- E brake wire
pin 30 to ignition side of cut starter wire
pin 87a to starter side of cut wire

I would think that this would work for what you are looking to do.
or below and substitute amp turn on with 12v+ from brake wire that goes 12v+ when you step on it.

posted_image

Or use cigarette lighter to complete circuit.

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The wire I'm test'n isn't doin' what it's supposed to be doin'... I am so glad I printed that tech sheet, with the wrong info.
Do it right the first time... or I might have to fix it for ya

Posted By: i am an idiot
Date Posted: November 25, 2007 at 7:53 AM

pin 85 to ignition 12v+
pin 86 to 12v- E brake wire
pin 30 to ignition side of cut starter wire
pin 87 to starter side of cut wire Notice change on this line too

Techman had 2 85s and no 86 You could also get the 12v+ for 85 from the Ignition side of the wire you cut. 85 and 30 can both go the the same wire.

Posted By: techman93
Date Posted: November 25, 2007 at 2:08 PM

OOOPS! I thought I wrote an 86 in my post. Sorry bout that.

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The wire I'm test'n isn't doin' what it's supposed to be doin'... I am so glad I printed that tech sheet, with the wrong info.
Do it right the first time... or I might have to fix it for ya