Anyone help me on this problem?

My original sound system stopped working. The block is ok, other than the cassette deck. The receiver, under the passenger side glove compartment was rebuilt recently.

I put everything back together ie, block and receiver, connected the connectors and only the front speakers play.

The antenna goes up and down. But the rear speakers are out.

I've done a little reading here on this site and I'm not sure but I believe I have the Delco system not Bose/Delco. The Bose/Delco systems had a separate amplifier? I read somewhere that if a speaker in the system does not work, 99% of the time the amplifier is no good.

So if that's true, where is the amplifier in the Delco system?

Anyone?

Thanks

 

Sounds like like amps are blown in the rears.The amps are located in the speaker housing itself.100.00 a piece to replace...But there is an alternative.Each rear speaker has a 12v positive and neg. lead and the preamp signal to them.I bought a 200w amp.Hooked up the power,hooked up the input.Jumped the output from the new amp directly to the Bose speakers and Voila'...Music...Tools required=Test light and a strong back..Youll be wrenched over for a while.

 

It appears I have the Delco system, not Bose/Delco.

According to what I've been reading, the Bose system was a bit of a nightmare when it was going in the crapper.

84-89, the unit was totally mounted in the dash ie, not separated into various components.

90-96, the system was divided into the head located in the dash and the receiver located under the glove box on the passenger side.

The receiver units in the 90-96 years differed between Bose and non Bose models.

Non Bose receivers have fin like attachments on the heat sink. Bose do not have these fins. The two can not be interchanged.


The Delco head was a radio and cassette only. This is what I have.

The Bose system was complicated with wires and impedence unlike any other system. Each speaker had it's own amplifier. I read something about 1 ohm somewhere in the wires. I got a lot of this info from corvettefever.com

Anyway, when the Bose system goes bad, there's noise and when the capacitors leak in the system, it smells.

The Delco non bose system is not known for it's sound but is supposed to be better in terms of durability and ability to be repaired.

I had my receiver repaired and was excited that it seemed to work. However, it's not until I had it all installed that I noticed the rear speakers are no longer working.

So, Monday, I'm off to the electronics guy to bench test it. It's either the receiver or the head.

IN the meantime, if anyone has some familiarity regarding the Delco non bose system and knows anything that I can check on my own,

LET ME KNOW, Please

Thanks

Ugh . . . mo money . .

 

Double check all the connections. Also, did you check the position of the Fader ****?

 

The fader and balance *****, but nothing from the rear speakers.

Thanks for the suggestion though. Sometimes it's the most simple things that make something seem impossible. And that sort of thing cetainly isn't beyond my abilities.

I have the carpet pulled back for the right side, front and rear.

The front speakers have connectors which go to the front speaker. They are dark green and light green.

The rear speaker connectors have 4 wires: Dark blue, light blue, brown and yellow. Not sure what they might connect to back there as all I have exposed is the speaker.

I was curious about the 4 wires going to the rear. Is there something back there that needs powering?

I didn't believe so on the more simple Delco system.

Anyone?

 

Ernie,

At the Radio Receiver there should be a 4 pin connector for the rear speakers. Called connector C4. (This end plugs into the Receiver)

Color of the wires are
Brown, Yellow, Dark Blue and Light Blue.

The other end of that 4 cavity connector called C212 ends at "Behind instrument panel near door" I assume they mean passenger side door.

From there 2 2 pin harness plugs, plug into that 4 cavity connector. Each 2 pin harness goes to two other connectors C312 a two cavity connector for LH Rear speaker. Wires are Brown and Yellow.

The other two cavity connector C311 goes to the RH Rear speaker. Wires are Dark Blue and Light blue.

The schematic shows a short 2 pin wire wires harness from each speaker that plugs into C311 and C312.

Location of C311 Right hand side of cargo compartment near RR speaker
Location of C312 Left hand side of cargo compartment near LR speaker

 

I have had problems with my audio. I went to factory car sterio repair inc. there site can explain a lot just look the whole site over.you can try them at www.carsterohelp.com

 

Thanks all for the suggestions.

I found out the problem using the manual. It's amazing what's in that thing for diagnosing stuff.

In non bose system, you can simply check a speaker that doesn't play by either hooking up the speaker and checking for ohms or attach a C or D battery for only 1 second and listen for a popping sound.

If you hear nothing, the speaker is dead.

So, two dead rear speakers.

Again, thanks