Originally Posted by mike100

Had to go to the u-pull-it wrecking yard for my old body style F150, but ended up coming away with a set of Sigma 975 amps front and rear as a consolation prize. The best part was using earlier advice to use the keyword 'switch' in the description because that invokes a much cheaper schedule when the girl went to her computer screen to price them.

"Speaker switches"
$3.95 ea! If a couple don't work I'm still happy.

These places have a bunch of sneaky hidden charges anyhow so you gotta play the system.

Originally Posted by jaymitchell01

Good Day Gentlemen - I have a tech question for the guys with CDM box removal/installation experience...

I just got a remanufactured CDM box for my 1991 Bose Gold system, went to install it and I can't find one of the plugs that go on the outboard side (the side with the 4 plugins). I looked high and low after shoehorning the CDM box back up in the dash, then pulled it back out to get a better look and STILL can't find it.

Can anyone tell me where it may have gone? I'm hoping someone here knows something I don't so I'm not spinning my wheels and tearing up my hands while fishing for the plug. Thanks in advance.

Originally Posted by jaymitchell01

Ken - I'll take your word for it because over the weekend I spent several hours fishing and looking for a fourth plug because there are 4 plugins on the outboard side. Since it was a couple weeks since I pulled it out, I couldn't recall if there were 3 or 4 plugs, so assumed there were 4.

Why does the CDM box have 4 plugins? Because its used in other car models? Either way, that threw me off and cost me some pain.

Thanks for saving me from more work Ken, much appreciated!!!

Originally Posted by jss06c6

Pulled both rear amps. Very clean. No circuit board damage evident. Will replace with new ones and repair the faulty one and recheck it for a spare.

Originally Posted by Ray Secrest

I have an earlier amplifier (P/N 1226427) than the one pictured. I am in process of replacing all electrolytic caps and am very much in need of circuit board layout similar to the one provided to determine cap value for the large cap adjacent to the three wound coils. Can anyone provide either board layout or the value of this cap, i.e., largest physical size of all. I do not want to remove to get value if a replacement cannot be found.

Thanks,
Ray

Originally Posted by kenpeindl

This shows both versions.

http://www.zr1netregistry.com/Portals/0/Bose2.pdf

Originally Posted by Dynomite

Did the sound deterioration start all at once?
Do you get any sound at all?
Did this happen on all four speakers at the same time?
Does it happen with CD as well as AM/FM?

I usually start at the speaker amps (exchanging Nissan Max 975s or 075s).
If one speaker amp exchange for a known good amp does not work...then Bose or CDM.

Last time I had issues I exchanged Bose for a known working Bose....found I had no sound after switching in a good Amp and good Bose. So exchanged CDMs and got all the sound back in great order.

If you have someone near by with a good Bose....it is about a 10 minute job to exchange a known working Bose for your Bose.

Same goes with amps....use the rear drivers side amp and exchange that for a known good amp.

Start with the easiest replacement and that be an amp....then the Bose.

Now if nothing as suggested above works.....have fun removing and exchanging the CDM

See Bose Speaker Amps and CDM Replace

The usual problem with Bose is the CD player does not take and run a CD.....that is Doc Dons department.