I have one of those. Numbers on mine are: 1384599-CO2....4969...8738

The CO2 and the 8738 appear to have been imprinted with a stamp or something, as they are not the same font and ink type as the others.

My 1989 Green Book shows these wire assignments (in CAPS):

1. SB (black) GROUND (spliced to #14, and to Radio ground, then to chassis ground point)
2. Y-W (yellow w/white stripe) LF+
3. Y-GR (yellow w/grey stripe) RF+
4. P-SB (pink w/black stripe) 12V+ (spliced to #11 and fed from Fuse 26)
5. N/C
6. W (white) LF-
7. GR (grey) RF-
8. Y-BN (yellow w/brown stripe) LR+
9. Y-SB (yellow w/black stripe) RR+
10. N/C
11. P-SB (pink w/black stripe) 12V+
12. GN-BN (green w/brown stripe) LR-
13. GN-SB (green w/black stripe) RR-
14. SB (black) GROUND

I don't know about power rating. I have a number of "Volvo" amps and they seem to have liked either 20W or 40W/ch power ratings. Most of the amps have this printed on a sticker or engraved on the amp cover. This thing is different, being more cube-shaped and with the cooling fan to draw air over the heatsinks, so who knows? 12V and ground wires are rather light guage, so it's not a powerhouse.

I made up an adapter to convert the Volvo DIN plug to female RCA connectors on a 40w/ch rear amp to drive the reardeck Infinity 6x9's in dtr's 940 (Blaupunkt head unit) and it makes lots of volume and much improved bass.
--
Bob (son's 81-244GL B21F-M46, dtr's 94-940 B230FD, my 83-244DL B23F-M46, 89-745(LT1 V8), 98-S90, 77MGB and four old motorcycles)