best way to convert positive to negative?

Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=115510
Printed Date: May 15, 2024 at 10:12 PM

Topic: best way to convert positive to negative?

Posted By: rodriik
Subject: best way to convert positive to negative?
Date Posted: August 06, 2009 at 9:25 PM

What is the best/simplest way to invert from + to -?

Replies:

Posted By: i am an idiot
Date Posted: August 06, 2009 at 9:27 PM

Convert a Positive Output to a Negative Output

If you have a switch or an alarm or keyless entry that has a positive output that you wish to use to switch a device that requires a ground such as a horn, dome light, parking lights, head lights, hatch release, etc., wire a relay as shown below to convert the positive output (trigger) to a negative output. posted_image

Here's the same configuration showing a positive output from an alarm or remote keyless entry used to activate a vehicle's parking light relay that requires a ground to turn the lights on. posted_image

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Let's Go Brandon Brown. Congratulations on your first Xfinity Series Win. LGBFJB

Posted By: rodriik
Date Posted: August 06, 2009 at 11:34 PM

Thanks. What's the best way to do it without a relay? This is in the cab and I don't want the clicking noise.

Posted By: racing_bidule
Date Posted: August 07, 2009 at 12:51 AM

rodriik wrote:

What is the best/simplest way to invert from + to -?

GET A WIFE!

LOL

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If you fail on your first attempt, at least destroy all evidence you tried!

Posted By: howie ll
Date Posted: August 07, 2009 at 3:56 AM

That last post was a classic, second, Mr. Idiot "ex master installer" what's the way to do it using transistors please, ie pos to neg and vice versa? Email me if you can't post it here.

Posted By: i am an idiot
Date Posted: August 07, 2009 at 8:00 PM

Howie, the things that you remember me posting were simple current amplifying devices. They are used for bluetooth modules that do not have enough current capacity to trigger a relay. Also used in some newer databus cars. There is sometimes not enough current to get an ignition source. If you connect a relay to the wire at the ignition switch, it freaks the car out. I do not know of a simple way to convert polarity with a transistor. I will make a call and see what I can find out for you.

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Let's Go Brandon Brown. Congratulations on your first Xfinity Series Win. LGBFJB

Posted By: OmarR
Date Posted: August 09, 2009 at 10:36 PM

Wouldn't it be easier to just mount the relay in the engine compartment and run the output wire into the cab?

Posted By: darksidecelica
Date Posted: August 10, 2009 at 8:31 PM

Hmm. I thought only relays can convert a + to a -.