Can someone tell me the location of the amp. in a 99 C70 coupe and where I might be able to come up with a sheet with the pin-outs for the plug. The radio that is in the car is the SC-816.
Thanks

The amp is within your head unit (CD, Cassette, radio unit). I have the same unit. A diagram of what's what on the rear is in this:
http://www.volvospeed.com/Repair/radiocon.php
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1998 S70 T5 Emarald Green Metallic, 2004 V70 2.5T Ruby Red, Previous Owner of Black '94 850 Turbo Wagon. My cars have been running so well lately they've got me worried.

Yes the connector looks like this but no speaker wire are coming out the back of the radio. The small plug only has one yellow wire and the large plug has one blk. red,yellow,green,pink, and one yellow with brown stripe. The radio has a din cable plugged into the back of it labled AMP not sure were this leads.

May be redundant by now, but the typical location is under the front passenger seat.

-KB
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'99 C70 Convertible || '99 V70R AWD || '90 780 Turbo (for sale)

Then I would think that your head unit IS hooked up to an amp somewhere and the speakers connected to that. Look under your seats...passenger seat?
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1998 S70 T5 Emarald Green Metallic, 2004 V70 2.5T Ruby Red, Previous Owner of Black '94 850 Turbo Wagon. My cars have been running so well lately they've got me worried.