Folks,

I have a 1991 240.

It still has the stock cassette / FM head unit TD-613 (Volvo PN 1398464) and the 20x4 amplifier mounted to the lower courtesy open-faced glove box just under the environmental controls and in front of the shift lever. The amplifier is PN 3533004 (826 Sweden 1991-11-20). And seems consistently referred to Volvo amplifier model number HA-4120.

Some years ago, I installed infinity brand speakers in the 1991 240 to replace the factory installed speakers in the front and rear door. The infinity speakers "opened up" the sound quality greatly. So, this amp, at least, has good sound quality for my needs. It'd be nice if it was more powerful, yet it works fine.

I have two more of these HA-4120 amplifiers. One has the wire harness (connects to radio, speaker wire harness, power) that came with a spare HA-4120 from the junk yard. That harness is pretty well hacked up, but I'm able to work with it. I also have an HA-2121 amp from a 760 as well as the HT-161 rear hat shelf speakers (new woofers installed, yet needs new tweets and mids - I put in used ones when I put the new woofers in).

Another is in my 1992 GL with the same set up (HA-4120), missing the radio, yet the prior scum owner hacked and slayed the factory wiring harness to install some boom boom junk leaving me with some serious corrections to the non-stereo harnesses in the dash and in the engine compartment. Those electrical repairs are complete. All of the boom boom junk is missing save for some monster cable.

The AM and FM on the 1991 240 TD-613 radio seem to have quit. I've read something about failing diodes on the noise suppression / reception circuit just after the connection to the aerial. I reflowed broken solder welds on the circuit board inside the stock stereo cassette. I think it is an HT-613? I forget at the moment since I put that radio someplace yet can't find it. I just found it.

However, I'd rather have a head unit with with FM/AM(/&SW?) with mp3 playin' CD. I guess I'd want a head unit without power amp out. Either way, I'll stick with the factory wiring harness for the front and rear door speakers as it is a quality conductor.


Can you kind folks suggest a head unit I can plug into the dash?


I found the pin-out of the 6-pin DIN connector between the TD-613 and HA-4120 here:



And a photo image from something similar on an amplifier.



I also found a Web page with some general wiring diagrams. A high level diagram for the 1991 240 radio and amp. It misses a few details I can fill in.



I'd like to use one or both of the other amps in the same or one of the other cars someday soon - hopefully to drive extra speakers. I'd been without a car stereo for a long time and I'm tired of it, save for the hum of the well tuned motor.

Sorry for the long post.

Thanks,

kittsgreyvolvo