Common ground vehicles

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Lokim

Member - Posts: 12

Joined: November 28, 2003

Posted: April 19, 2004 at 4:27 PM / IP Logged

how do i install a radio? (w/o running all new wires.)

icu400

Copper - Posts: 123

Joined: April 12, 2004

Location: United States

Posted: April 19, 2004 at 4:46 PM / IP Logged

installing a new stereo all you should have to do is pop out the old one, and pop in a new one, get a wiring harness and you should not have to run any wires at all...

forbidden

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Joined: November 01, 2003

Location: Alberta, Canada

Posted: April 19, 2004 at 4:47 PM / IP Logged

With a floating to common ground adaptor. Run the new wires, it would be best that way.

Top Secret, I can tell you but then my wife will kill me.

Lokim

Member - Posts: 12

Joined: November 28, 2003

Posted: April 19, 2004 at 5:12 PM / IP Logged

is there any way to do it without running new wires?

flynntech

Copper - Posts: 275

Joined: April 15, 2004

Location: United States

Posted: April 20, 2004 at 1:16 AM / IP Logged

There is a reason why common ground systems aren't so 'common' anymore....

Stop being lazy and run your wires!

mr12volt

Member - Posts: 28

Joined: June 17, 2003

Posted: April 20, 2004 at 11:24 AM / IP Logged

If you dont run new wires you run a better than good chance of frying your radio. With the common ground the negative wire coming off of the speakers are grounded to the chassis. When you wire the new radio to the chassis you can, and more ofter will, short out the radio.

kmn5

Copper - Posts: 66

Joined: April 21, 2003

Location: United States

Posted: June 01, 2004 at 2:07 AM / IP Logged

Yeah I got the EXACT same problem on my Lexus SC300

ARGHHH!!!!

I pulled out the factory headunit and factory amp in the trunk. And find out that it's common ground! Doh!!!

The factory amp generated the pos/neg signals for all the speakers.

But from the HU to the Amp it's common ground negative Common ground vehicles -- posted image.

kmn5

Copper - Posts: 66

Joined: April 21, 2003

Location: United States

Posted: June 01, 2004 at 2:09 AM / IP Logged

my only options now are to run new negative wires from the HU to the rear harness, or get a 4 channel amp and use the RCA to the rear then output the pos/neg signals from the amp....

any suggestions or comments??

thanks

Ken

DYohn

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Joined: April 22, 2003

Location: Arizona, United States

Posted: June 01, 2004 at 8:17 AM / IP Logged

kmn5 wrote:

Yeah I got the EXACT same problem on my Lexus SC300

ARGHHH!!!!

I pulled out the factory headunit and factory amp in the trunk. And find out that it's common ground! Doh!!!

The factory amp generated the pos/neg signals for all the speakers.

But from the HU to the Amp it's common ground negative Common ground vehicles -- posted image.

Actually (if you have the system I think you have) you are seeing line level signals going from your head to the amp, not "common ground." Common ground means the negative on the speaker side uses the car chassis, and that is not the case in a Lexus. The line level signal from the head to the factory amp shares ground, but this is normal in many line level systems. If you are using a powered head unit and want to run speaker level signals from the head, you must run new speaker wires as you currently have none at the factory head.

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jimmeezgolfvr6

Silver - Posts: 258

Joined: March 10, 2002

Location: Canada

Posted: June 01, 2004 at 9:29 PM / IP Logged

listen to the good advice above. for the amount of time you've spent looking for another way to do it, you could have run new wires already.

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