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general motors switched power idiocy

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=127796
Printed Date: May 16, 2024 at 7:58 AM


Topic: general motors switched power idiocy

Posted By: masterodisaster
Subject: general motors switched power idiocy
Date Posted: July 02, 2011 at 7:11 PM

I have had this problem several times and I'm just looking for a reason WHY.  I tap (typically) a brown wire that shows switched power at either the fuse box location, or ignition harness (because some idiot engineer thought it would be cool not to have switched power anywhere in their vehicles) but after I hook to it, the voltage dissappears.  What kind of circuit is this?  My hatred for American made vehicles is increasing every year.  Trailblazers, seem to be the worst.



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Replies:

Posted By: i am an idiot
Date Posted: July 02, 2011 at 7:32 PM

What kind of current is your device demanding from the circuit?  You may need to use a transistor and a relay.  I will look for a post about your problem.

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Posted By: i am an idiot
Date Posted: July 02, 2011 at 7:54 PM

The above diagram will provide you 2 amps continuous current.  If you need more than that, you need to make the right leg trigger a relay.

And no, I am not the idiot that designed the new GM stuff.  That was another Idiot.




Posted By: masterodisaster
Date Posted: July 02, 2011 at 8:01 PM
Lol - Thanks for the reply.  I've used a relay in the past with some success.  I just today had that issue and it came back like 20 minutes later not working and made me look like a fool - I had to vent.

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