Channels missing - Just bought an old Tahoe that has an Alpine CDE-9870 and I assume

[bldn10]

OEM speakers. I get full volume from RF and a slight bleed over into the other speakers - e.g. not full volume but you can hear some faint tinny sound. I haven't had unit out so don't how it was wired. Any thoughts re problem? Thanks.

Bill/Memphis

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[Louisiana_CRX 5,000+ posts]

Factory GM speakers are very low grade...Id look at upgrading the speakers.....even some basic name brand speakers would be a nice improvement

 

[bldn10]

You are probably right but I'm not spending any $ on speakers if I can't get a signal to them. Need to solve this problem first.

Bill/Memphis

 

[disturbed471985 5,000+ posts]

Remove HU and redo wiring. Best way to narrow down your issue.

 

[akheathen Premium Member]

lol, delco speakers aren't that bad...... that's all i have in my 01 tahoe, and they sound just fine, and are efficient. they just don't like being clipped. now, what year tahoe? it probably has a blown stock amp behind the ash-tray-ish, or glove-box, depending on year. check the wiring of the hu first, and test output from each channel.... bypass the stock amp, and call it a day, most likely. need info.

 

[bldn10]

It's a '99. So there is a stock amp separate from the Alpine unit? Down below? I don't have the bracket keys to remove the HU so I was hoping to know what was probably the issue before buying some. If it's the amp I may not even need to take the HU out.

 

[disturbed471985 5,000+ posts]

Did u install or a shop?

 

[bldn10]

"Just bought an old Tahoe that has an Alpine CDE-9870..."

I would think that the symptom of slight bleed over into the otrher 3 channels means something. I'd think that means the speakers are working but not getting channel signals.

 

[All_Logix 10+ year member]

That "bleed over" sounds alot like it is that factory amp giving you problems... The amp should be behind the glove box, also you would have to pull the HU out to see this but in those year models I believe you have to connect the remote wire on the HU into a little pink wire on a separate harness back there to make it all work correctly

 

[akheathen Premium Member]

also, simple things first...... check the fuses.... you say rf, and iirc, that is the one channel that can play with the amp having no main power. i do remember seeing just that problem on more than one 99+ pickups (only full volume on the rf speaker)

oh, and you may be able to have a shop pull the deck out with their forks for free, or they might be nice enough to just toss a couple spares your way for free....

 

[bldn10]

I don't see a fuse that is labeled for the amp - radio yes, and it is obviously OK. Does the amp run off some other fuse?

 

[its10v1 10+ year member]

Like most amps, it probably has one (possibly two) on the amp itself.

 

[bldn10]

"you say rf, and iirc, that is the one channel that can play with the amp having no main power. i do remember seeing just that problem on more than one 99+ pickups (only full volume on the rf speaker"

OK, found the amp and disconnected the plug and... no change - still get sound from RF but nowhere else. Didn't have right wrench to pull amp. Does that mean amp is bad? There appear to be some wires entering the top side (furthest away) but I can't get to them w/ the amp in.