No Sound Alpine CDM 7874. I Have alway had it installed in my van. I changed my battery on day then turn on the radio and the fuse blew at the same time heard some noise through the speakers. I replace the fuse, the radio came on but no sound trough the speakes(4). I check all the wiring, no shorts or exposed wires, every thing else works but still no sound .

There should be no code. If you can try to see if you can check to see if power is getting to the red and yellow wires on the back of the radio. If there is a reset switch, try pressing that. It should be a small depression about the size of a pencil tip on the face or a hole with a red switch behind the face on the subpanel.

If your head unit was installed properly there would be 15 amp inline fuse on the yellow power lead.
Also check your vehicles fuse panel for a blown accessory fuse.

if you want to put a new car stereo in ur car you can buy a plug from wal-mart that is color coded to do the change for you

turn off ur unit then ull just see the time on then u can set it up!

You have the wrong blue wire connected.
Your power antenna wire is hooked to the amp remote wire and vice versa.
Your radio thinks the tuner is off - and is dropping the signal thru the power antenna wire - and turning off your amplifer.
Switch the 2 blue wires in your install - and you'll be all set.

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It could be a bad burn or an issue with the receiver. Try re-burning the CD and see if that helps.

There should be a fuse on the back of the head unit. Make sure to also check the vehicle's radio fuse.

You need to run the RCA cables from the head unit to the sub for the audio signal, and possibly a turn on wire (the blue one on the back of the head unit), unless the sub has an automatic power feature.

The sub also needs power and ground wires attached, but those do not connect to the head unit. Power should be run directly from the battery with an inline fuse, and ground should go to the nearest good ground point (Trunk latch, seat bolt, etc).

Most radios go into a silent protection mode when speaker wires are shorted, so it's worth checking those.

I need a wiring harness that plugs into the back of alpine cd player cdm-7874 & a user manuel