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Probably because you got the spark plug wires plugged onto the wrong spark plugs.
The speaker wires on a 2005 Avalanche are white. Most automobile manufacturers use white wires for the speaker wires. After market speaker wires are usually red or blue in color.
Disconnect wires at antenna
Normally Red is constant, Yellow is Accessory, Black is Ground, blue is for antenna. Be sure to check those with a digital multimeter!... Speaker wires are a bit of a hassle but I found mine by using a 9 volt battery, go wire to wire til you heara "pop" Then determine which speaker is making the noise, those wires go to that speaker. The easiest way possible is to get a manual!
Other things that speaker wires can be used for is power transmission. Speaker wires have negative and positive glued together in the insulation, it isn't intended for this purpose but can work.
Red-Ignition Yellow-Battery (memory) Blue-Remote(antenna) Black-Ground Green Wires-Left Rear Purple Wires-Right Rear White Wires-Left Front Grey Wires-Right Front http://forum.ecoustics.com/bbs/messages/4/251407.gif
There are numerous wires on the back of the radio including powers, grounds, speaker, antenna, CD changer controls, computer communication, etc.
If you do not see an external antenna, then it is in either the front or rear windshield. Look closely and you will see the tiny wires that make up the antenna.
To find your speaker wires, check your owners manual. You should find a diagram with the location and color of your speaker wires.
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antenna wires
There are three plugs in the back of an Echo radio. Before I blew the fuse, this is what I had figured out. The black one, of course, is the antenna. The other two plugs are white(5 wires) and blue(8 wires). The white plug is mainly speaker wires. The blue plug has speaker wires and the power and ground wires. White plug: Black and Gold wires --- right speaker(not sure front or back) Red and White wires --- left speaker(not sure front or back) (Not sure about the white/green striped wire) Blue plug: Purple and Pink wires --- speaker(not sure L or R, front or back) Green and teal wires --- speaker(not sure L or R, front or back) (Not sure about the green wire) Power in blue plug: Grey wire --- Main power(thru ignition) Teal/yellow striped wire --- Accesary power(constant for stations or clock, etc...) White/black striped wire --- Ground That's the wiring, now if anyone can tell me where the fuse is, I would be ever so appreciative. White Plug: Black and yellow wires are left rear speaker, red and white are right rear speaker, green and white are part of the interior lights system.(I recommend not touching thoughs as it will break the circuit and the interior dash lights won't work at all) Blue Plug: green and blue are left front speaker, pink and violet are left front tweeter speaker (on 6 speaker systems), then the other two blue and green, one is right front and the other is right front tweeter speaker (on six speaker system.