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I have a CDA 7892
You didn't specify if you wanted the display brighter in the daytime while headlights are off or if it is too dim when the headlights are on, with respect to the rest of the instrument panel illumination. Too bright is easier to deal with but too dim is tough. If it is always too dim under but daytime and night time conditions the only way to improve brightness would be to very gently disassemble the front panel (easier if it is the removable type) and determine what provides the back lighting. If there are tiny LEDS you could painstakingly add more LEDS or swap them out for brighter LEDS. There could be a lot of guesswork determining if this or that LED was brighter than what is in the unit as built. It may just be easier to live with it as-is.
I have no harness for
The install diagram indicates the Audio Interrupt wire goes to a Vehicle Phone. If you don't have one, don;t connect it to anything andmake sure you put tape over the end so it doesn't touch ground or a power source.In cases where I don't have or cannot get a wiring harness adapter to plug directly into my vehicle wiring harness I have a trick I like to use. I don't like to cut and remove a vehicle harness socket, I may want to keep the aftermarket stereo when I sell or trade and put the original stereo back in place. Instead of removing the socket I skin back (but do not cut) the wires I need to tap into and wrap the aftermarket unit's wires around the now exposed socket wiring, then solder each one & wrap each one individually with electrical tape. This gives you a secure connection and when and if you need to permanently remove the aftermarket unit you just untape the wires, clip the fatermarket wires off one at a time very close to where they are tapped in, tape each one of them again and there you have the factory plug ready to plug back into the factory stereo.
Auxilary RCA inputs have no volume control
Your problem stems from the fact that the CDA-7892 is not equipped with an RCA aux-input jack. If you're plugged into RCA connectors at the back of the head unit, they're outputs, not inputs. The sound you hear is just feeding back through the outputs and into the head unit's amplifier.
If you want to play your iPod through this head unit, you need to purchase either the auxiliary input adapter (KCA-121B) or iPod adapter (KCA-420i).
A alpine radio sound is
Does this happen often or was this a one time issue and you still don't have sound?
If its a one time issue there's a fair chance that a fuse blew and will need to be replaced.
I've had this happen to me quite a few times and fuses can be fairly cheap.
Does alpine CDA7892 have MP3
Yes it does have MP3 capability.
In the set up menu (press and hold set up button for at least 3 seconds) you need to select CD/MP3 with the up or down buttons. Then use Band button to make sure CD/MP3 is selected and you can play back MP3s that are burned to CD and also ordinary CD tracks.
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