I have an old Daewoo car (from 1995) with a non working stock radio unit (a Philips DC508D).
I got a "slightly less old" Pioneer DEH-2000R (from 1998) as a replacement. None of them has any kind of ISO connector but I managed to find the wiring (the Pioneer seems like it had one, but the previous owner has cut the cables out).
I would like some advice about three particular points:
On the "proprietary connector" I salvaged from the old Philips radio unit, the "-" of all 4 speakers are connected to the ground. Should I keep them this way or should I separate them before connecting the Pioneer?
On the Philips wiring, there was a 3A fuse in the ACC wire. The Pioneer has a 7A on the ACC wire and a 15A one on the "backup" wire (not sure about the name; that's the yellow wire which always provides 12V). I'm pretty sure keeping it in place won't cause any issue, but shouldn't I change it for something smaller? (like the 3A from the Philips unit). 15A seems kind of a lot to me, and regarding the previous cabling work, I suspect the previous owner just put in the first fuse he found that fitted inside... And what about the 7A one? should I also find something more reasonable?
There is a small box between the ground and ACC wires on the connector of the Philips (between the connector and the unit). It contains a small transformer and a capacitor (see picture below). Should I put it back between the Pioneer and the connector? I think I shouldn't but I have no experience with car electronics so any advice is welcome.
PS: if it helps, the Pioneer's service manual is easily available online (http://www.manualslib.com/manual/864371/Pioneer-Deh-2000r.html)