connection with only ground, switch 12v+

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=95512
Printed Date: May 14, 2025 at 10:14 AM

Topic: connection with only ground, switch 12v+

Posted By: spielnicht
Subject: connection with only ground, switch 12v+
Date Posted: July 11, 2007 at 12:02 PM

I have a portable GPS nav unit that can be hardwired instead of using a cigarette lighter. For power, it has three wires, Ground, Permanent 12V+, and Switch 12V+. I'm planning on tapping into the three wires of the stock radio for power.

Hypothatically, if I did not want to go that route, and just wanted to tap into the cigarette lighter which has only Ground an Switch 12V+. How do I go about this?

Thanks in advance.

Replies:

Posted By: KarTuneMan
Date Posted: July 11, 2007 at 1:05 PM

You could tie together on your GPS, the constant and switched?

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Posted By: pendulum
Date Posted: July 12, 2007 at 2:31 AM

If you do as KarTune suggested, then your GPS will not turn itself off. You would ned to pull a fuse or cut a wire. I would run the grounbd to a good clean ground, then use the ignition harness. Or, use your radios constant 12v and Remote turn on. I have blown fuses and had things just not turn on when tapped into the switched 12v on a head unit. You could also use your HU's switched 12v to power a relay, which would then activate the GPS. Easiest would probably be #2

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1999 Toyota Camry
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Pioneer DEH-P3700MP
Lightning Audio Strike S4.15.VC2
Lightning Audio Strike S4.500.1
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