I have a Blaupunkt Bahamas MP46 I want to install in my 84 300cd.

I have the harness and can figure out rewiring the speakers and stuff. I also have a subwoofer and a bridgeable amp. I expected there to be RCA outputs on the back of this HU, but there aren't any.

I think I have to order this:

http://cgi.ebay.com/Blaupunkt-car-stereo-4-channel-pre-amp-out-cable-RCA-/170627925337?pt=UK_Cars_Parts_Vehicles_Terminals_Cabling_ET&hash=item27ba378559#ht_915wt_698

What do I do with the 4 preamp outputs? Which do I use to connect the RCA to the amp?

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1984 300CD

A yellow RCA typically represents "video". The black RCA could possibly be the sub out. That would leave the red and white connections for "right" and "left" respectively.

Otherwise, if I'm in left field there, I would guess the yellow and black would be the rear channel outputs, so that the HU fader can control front and rear.

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car