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Old 07-07-2015, 12:14 AM   #1
1st Gear Newbie
Join Date: Aug 2014
Location: SW Ontario
Posts: 46
stock radio overheating, help?

I have a 93 E31, it had a CM5903L head unit, with 6 disc changer. I don't know if this unit was the original unit. It worked perfectly, then crackling of all 4 speakers, and diminshed volume became more and more frequent. I pulled the unit out and sent it out for refurbishing. While its gone, I found another one on Ebay, that was listed as fitting numerous models, I figured at worse I'd have a spare...

when I plugged the "new" one in, I smelled the burning wire smell, sound was ok on fronts, CD worked, rear speakers were crackly, then saw wisps of smoke from the rear of the unit. You could not touch the heat sink due to high heat. Could I have a unit not compatible with the E31 harness? I thought maybe I had a short in a rear speaker, but after disconnecting the rears, it heated up again, I checked the speaker wires to ground, and got no continuity.

any ideas? any help would be much appreciated, I'm trying to keep the car as stock as possible, so don't want to go with a different head unit...
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