I may have asked this q before, but I now have new information.
When installing my Eclipse head unit I found the included Eclipse wiring harness came with a long black grounding wire with a forked terminal connector installed. The wiring diagram shows this ground not attached to the ground wires in the factory harness but run alone to a suitable chassis grounding point. I used an adapter harness and as the factory harness that I was adapting the Eclipse harness to had 2 ground wires that would be left unconnected I decided to solder the adapter ground to the long Eclipse harness ground for good measure. Everything worked fine and there is no whine noise in the system.
I had the head unit out earlier today to install a more suitable cable for my Mp3 player and decided to clip the connection from the long ground wire with the adapter harness wire.
When I turned the system on there was a very obnoxious humming sound.I butt spliced the connection back and all is good again. I sometimes cant leave well enough alone.
I grounded the forked terminal to the all metal structure that the support attached to the back of the radio clips on to and slides back in position. This nylon bracket on the back of the radio that slides down the metal support structure is what supports and stabilizes the back of thr radio.I cant tell for sure if this metal structure is actually attached to other shhet metal and is continuous with the chassis but feel that it is.
Replies (3)
swez on 04/14/2007 15:26:39
That linked me to an MSN signup page??? The hyperlink brought me right back to this post???
OK, now you know the value of a dedicated ground for Aftermarket HU's. I have preached on this for a long time and this is the first question I ask folks with noise problems... "Where's the HU grounded"?
Some harness grounds are robust and direct to a good chassis ground. Most share a grounding buss with dash panel displays and don't work well enough to be totally noise free. (That often means noise problems from the get-go)
I looked at Crutchfield's site for a manual on the Eclipse CD 5000. They don't show that model now. I see the CD 7000, but cannot determine what is meant by Pin #7 w/o your document. Do you know what function this #7 pin is used for? (A factory harness ground?)
Swez
jamesp on 04/14/2007 16:23:51
Swez, if and when you get a chance i sent a copy if the manual and attached the wiring diagram.
The noise only happened when I deleted the "extra" ground which just gave 1 of the 2 factory chassis grounds continuity. ..I doesnt make sense to me..but thats not unusual.
In order to get rid of the noise I had to add it back to the Eclipse harness grounding wire.
In the pdf manual , the install info is at the end of the manual...Thanks
cplkittle on 04/14/2007 17:30:28
I was heading out of town tuesday night and my friend/coworker picked me up in his truck. As we drove down the mountain, I noticed that one of his headlights was out. When I got out to look, the dim light on the passenger side was alot dimmer than the other side, and the high beam didn't even work on the passenger side, but when the lights were on high beam, the blinker lights lit up.
I scratched my head for a minute, but then it came to me... bad ground. I attached another ground to the high and low beam and everything worked fine.
Basically, when one item can't get a ground, it travels back through other circuits trying to find a ground. That is where the noise comes from. Some will notice a pop pop pop in sync with the blinker lights, or a hum that fluctuates with the winshield wipers. A ground wire, like in your case, can get overloaded. An interesting thing to try is connecting a voltmeter to a ground wire like this one and ground the other terminal. You will see that the ground wire will read 2, 4, sometimes 6 or 7 volts making it a wire of lesser voltage, but not a good ground wire.
When installing my Eclipse head unit I found the included Eclipse wiring harness came with a long black grounding wire with a forked terminal connector installed. The wiring diagram shows this ground not attached to the ground wires in the factory harness but run alone to a suitable chassis grounding point. I used an adapter harness and as the factory harness that I was adapting the Eclipse harness to had 2 ground wires that would be left unconnected I decided to solder the adapter ground to the long Eclipse harness ground for good measure. Everything worked fine and there is no whine noise in the system.
I had the head unit out earlier today to install a more suitable cable for my Mp3 player and decided to clip the connection from the long ground wire with the adapter harness wire.
When I turned the system on there was a very obnoxious humming sound.I butt spliced the connection back and all is good again. I sometimes cant leave well enough alone.
I grounded the forked terminal to the all metal structure that the support attached to the back of the radio clips on to and slides back in position. This nylon bracket on the back of the radio that slides down the metal support structure is what supports and stabilizes the back of thr radio.I cant tell for sure if this metal structure is actually attached to other shhet metal and is continuous with the chassis but feel that it is.
Replies (3)
swez on 04/14/2007 15:26:39
That linked me to an MSN signup page??? The hyperlink brought me right back to this post???
OK, now you know the value of a dedicated ground for Aftermarket HU's. I have preached on this for a long time and this is the first question I ask folks with noise problems... "Where's the HU grounded"?
Some harness grounds are robust and direct to a good chassis ground. Most share a grounding buss with dash panel displays and don't work well enough to be totally noise free. (That often means noise problems from the get-go)
I looked at Crutchfield's site for a manual on the Eclipse CD 5000. They don't show that model now. I see the CD 7000, but cannot determine what is meant by Pin #7 w/o your document. Do you know what function this #7 pin is used for? (A factory harness ground?)
Swez
jamesp on 04/14/2007 16:23:51
Swez, if and when you get a chance i sent a copy if the manual and attached the wiring diagram.
The noise only happened when I deleted the "extra" ground which just gave 1 of the 2 factory chassis grounds continuity. ..I doesnt make sense to me..but thats not unusual.
In order to get rid of the noise I had to add it back to the Eclipse harness grounding wire.
In the pdf manual , the install info is at the end of the manual...Thanks
cplkittle on 04/14/2007 17:30:28
I was heading out of town tuesday night and my friend/coworker picked me up in his truck. As we drove down the mountain, I noticed that one of his headlights was out. When I got out to look, the dim light on the passenger side was alot dimmer than the other side, and the high beam didn't even work on the passenger side, but when the lights were on high beam, the blinker lights lit up.
I scratched my head for a minute, but then it came to me... bad ground. I attached another ground to the high and low beam and everything worked fine.
Basically, when one item can't get a ground, it travels back through other circuits trying to find a ground. That is where the noise comes from. Some will notice a pop pop pop in sync with the blinker lights, or a hum that fluctuates with the winshield wipers. A ground wire, like in your case, can get overloaded. An interesting thing to try is connecting a voltmeter to a ground wire like this one and ground the other terminal. You will see that the ground wire will read 2, 4, sometimes 6 or 7 volts making it a wire of lesser voltage, but not a good ground wire.
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