wiring polarity to plug

Printed From: the12volt.com
Forum Name: General Discussion
Forum Discription: General Mobile Electronics Questions and Answers
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=68048
Printed Date: May 09, 2025 at 5:39 AM

Topic: wiring polarity to plug

Posted By: KaMLuNg
Subject: wiring polarity to plug
Date Posted: December 09, 2005 at 7:03 PM

i am trying to hard wire my radar detector but do not want to hack up the cig lighter since im going to leave it in my other car... i have a few universal plugs left over from a plug i bought for my speakers... i want to make sure im wiring the leads correctly...

the rear one is a little longer than the inner one (right one)... the longer one should be positive... please verify... here is pic...

posted_image

Replies:

Posted By: menace2sobriety
Date Posted: December 09, 2005 at 8:31 PM

usually the inner one is the + why not check it with a dmm and be sure about it.

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Posted By: KaMLuNg
Date Posted: December 09, 2005 at 9:10 PM

how do i do it with a meter?

Posted By: Hornshockey
Date Posted: December 09, 2005 at 9:55 PM

check continuity between the plug and the pins; generally the outer surface of a plug like that is negative. Same goes for a cig lighter plug.

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