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i have a 1978 volvo 240, and the Memory (12.6 volt constant) was blue and the Ignition (12.6 volt switched) was black. for some reason volvo had the magnificent idea to make both the power wire and the ground wire black. the difference is that the fat black wire is your ground, the thin one is your ignition. and if you're not grounding it, you should start with that.
this is a color code diagram i found online for volvo cars. i use the site to get the color codes for when i install things in my friends cars (nissans, hondas) and its generally correct. it doesn't match my car, but mine is also 24 years old. perhaps it matches yours.
Memory (+12 Constant) Green
Ignition (+12 Switched) Black
Ground (-) Fat Black
Illumination - Yellow (not on plug)
Power Antenna - Red
(http://robco.netfirms.com/wiring/volvo.htm)
if you are thinking the red and yellow are the power wires, this would explain your problem.
also, on your wire harness coming from your Sony, those two blue wires are for your power amp, should you choose to use one. i used to have a 1999 Sony cassette deck in the volvo, and the solid blue wire was the +12 switched, and the blue with a white line on it was +12 constant. i may have mixed the two up, but thats what they are used for. i didnt use the constant wire however because it didnt supply enough power but i did use the switched wire as my remote wire for the amp.
hope this helps. feel free to email me if you have any questions, or if i said something that seems unclear. -- phrewt@worldnet.att.net
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