Car radio wiring

[Richard9025]

Hello !
I found this radio [Sharp RG-F813G(BK)] and I saw that the negative wire is hanging out (highlighted in photos)
Is it normal ?


Service Manual (page 8 for schematic) : https://drive.google.com/open?id=0B4XK2LKcEWXnTjRoVGxRcUcwUmc
Also , will this radio work with this 13,8v 5A DC Linear power supply ? http://www.ebay.com/itm/CB-RADIO-SWITCHING-POWER-SUPPLY-ALBRECHT-SW-57-5-7A-50Hz-230V-/172279875507 (Radio is 12v 50w)

 

[Tha fios agaibh]

looks like it broke off. It probably worked in the car without it because the chassis was grounded to car frame.(negative ground)

I would try and reattach it if you can find the other end. oh, and insulate those connections with tape or shrinktube.

Power supply sounds fine.

 

[Kiwi]

I might be getting old and blind, but I can't see an external negative connection in the diagrams, so would assume that the case was the negative/ground. As advised this is usually not an issue when fitted to a negative earth car, provided that the radio is electrically connected to the car chassis when installed.

For your non auto use I would suggest that you connect the broken black wire to the threaded stud on the centre rear of the radio.

The only issue I can see is that you may have to keep power on the pink memory wire to retain channel settings etc.

Probably pay to open up the filter/fuse box to check the fuse size. May need to change it down to a maximum of 5A.

Would also suggest that you try it on a car battery to make sure it works before purchasing the power supply.
If possible you could also check its current draw at the volume you want, as I have seen power supplies unable to keep voltage up at higher volumes or when loud sounds occur.

 

[davenn]

Service Manual (page 8 for schematic) : https://drive.google.com/open?id=0B4XK2LKcEWXnTjRoVGxRcUcwUmc

please don't put info on sites where people have to sign up for something just to see it

post a gif/jpg image here

 

[Richard9025]

I isolated the wires with some tape and I connected the broken black wire to a screw under the threaded stud (also checked inside the radio if that screw touches something inside , it doesn't)

On the diagram it shows that the ground wire (the broken one) is grounded to the chasis (the symbol highlited in green )

So , did I connect the broken wire where it should be ? (I wanna use this radio at home with a power supply)
Also , I found this power supply , which should work with this radio if the wires are correctly connected