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shared power , ground wire


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maniotas1 
Member - Posts: 3
Member spacespace
Joined: March 29, 2009
Posted: March 29, 2009 at 8:20 PM / IP Logged  
Hi,
I am currently in the progress of adding an indash monitor to my car alongside my Headunit.
I wanted to ask if there would be any issues caused by splicing it into the same power and ground wires currently connected to my head unit?
I have tried searching through the forum for the answer to this, but I could not find anything.
Both headunit and monitor have fuses on their power lines, is this enough to protect them?
Also, if I connect both the head unit and monitor to the same ground wire will I get noise/interference?
Basic picture of what I mean:
shared power , ground wire -- posted image.
haemphyst 
Platinum - Posts: 5,054
Platinum spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spacespace
Joined: January 19, 2003
Location: Michigan, Bouvet Island
Posted: March 29, 2009 at 8:22 PM / IP Logged  
No, you'll be fine.
It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."
maniotas1 
Member - Posts: 3
Member spacespace
Joined: March 29, 2009
Posted: March 29, 2009 at 8:26 PM / IP Logged  
thank you for the quick reply, and sorry if its a stupid question.
So there wont be a ground loop caused by having the two grounds connected?
haemphyst 
Platinum - Posts: 5,054
Platinum spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spacespace
Joined: January 19, 2003
Location: Michigan, Bouvet Island
Posted: March 29, 2009 at 8:50 PM / IP Logged  
No. That's not what a ground loop is. A ground loop is caused when there is a lower return resistance between electronic devices OVER THE SIGNAL cable, causing the introduction of noise. You aren't doing anything remotely close to anything that could cause a ground loop. You are creating a STAR ground, and is preferred to multiple grounding points.
Interesting article regarding ground loops...
It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."
maniotas1 
Member - Posts: 3
Member spacespace
Joined: March 29, 2009
Posted: March 29, 2009 at 9:33 PM / IP Logged  
Thank you so much for the peace of mind. Soory once again if the questions are Noob questions.
Currently reading the attached article.
Thank you again

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