Scania stereo

UK PROFESSIONAL DRIVERS FORUMS THE UK PROFESSIONAL DRIVERS FORUM (INTERACTIVE)
1

I tried to put my own stereo in 56 reg R480 today (mine has bluetooth,usb,aux in etc etc). It worked for about 10 seconds then died :frowning:
I know its not a 24volt stereo in the scania but what i also didnt know is that it is a 14 volt stereo :open_mouth: Ive never heard of a 14 volt stereo but sure enough its there in the handbook, 14 volt supply!

2

I would think that’s the same thing as a 12V stereo as the voltage is only a nominal value. A car/truck battery always has more then 12 or 24v across it - the dash display on my premium for example shows the battery voltage at somewhere between 27.5 and 28V most of the time. I think you’ll find most 24-12V droppers will actually output something like 13.8V - any CB users out there will probably know that the mains power supplies you get to run a car CB in your house put out 13.8V.

Paul

3

Your fancy stereo will draw a lot more current, amps, than the standard unit will. It’s probably more than the dropper can handle, which will be between 5 and 10 amps and a lot of these units with Bluetooth, USB and so on are getting up toward 15 amps, so you’ve more than likely killed that.

4

Exactly what i thought, hence why I didnt worry when I tested the voltage and it showed 14 volts before I fitted it.
It has melted the in-line fuse and holder, hopefully thats all the damage!

5

It has a 20 amp dropper in it and thats still working.

As for fancy stereo its about 3 years old Wharfedale that cost me £50 from argos! But, it has done me fine in all other trucks Ive had it in.

6

He plugged it in, & let the smoke genie out … :laughing:

7

Coffeeholic:
Your fancy stereo will draw a lot more current, amps, than the standard unit will. It’s probably more than the dropper can handle, which will be between 5 and 10 amps and a lot of these units with Bluetooth, USB and so on are getting up toward 15 amps, so you’ve more than likely killed that.

I would have thought that manufacturer supplied droppers would be of the type that will just fail safe and cut off temporarily and repeatedly in the event of excess current draw.I’m sure i will be corrected if wrong in this :smiley: Sounds like skids’ stereo just developed a fault and fried itself.20A dropper was supplying what it was designed to,radio taking more than makers and fuseholder intended.skids-what did you test dropper output with?

8

skids:
It has a 20 amp dropper in it and thats still working.

As for fancy stereo its about 3 years old Wharfedale that cost me £50 from argos! But, it has done me fine in all other trucks Ive had it in.

I’m that case I would say your radio is bolloxed.

9

All supposed 12volt stereos are designed to work on 14volts - if you look up the specs it will show you this as the nominal voltage - most are 14 volt
cheers
Steve

10

12v is the MINIMUM that you should be getting from a 12v system. Most car stereos are designed to run at 14.4 or more, as this is the output when fully charged.

Have you got the red (ignition) wire and the yellow (permanent live - preset memory etc.) wire connected correctly? Reason I ask is that I know some cars have these wires back to front (Peugeots from memory for a start), so not sure which way around your Scania is.

11

should just blow the internal fuse and be fine once replaced, but not if you plug it back into a 24v system again

12

mikey-t:
should just blow the internal fuse and be fine once replaced, but not if you plug it back into a 24v system again

I never plugged it into a 24v system the 1st time!!

13

Sir +:

Coffeeholic:
Your fancy stereo will draw a lot more current, amps, than the standard unit will. It’s probably more than the dropper can handle, which will be between 5 and 10 amps and a lot of these units with Bluetooth, USB and so on are getting up toward 15 amps, so you’ve more than likely killed that.

I would have thought that manufacturer supplied droppers would be of the type that will just fail safe and cut off temporarily and repeatedly in the event of excess current draw.I’m sure i will be corrected if wrong in this :smiley: Sounds like skids’ stereo just developed a fault and fried itself.20A dropper was supplying what it was designed to,radio taking more than makers and fuseholder intended.skids-what did you test dropper output with?

Tested it with a voltmeter.
Looks like I’m going to be putting up with crappy FM transmitters for the ipod :frowning:

14

skids:
Tested it with a voltmeter.
Looks like I’m going to be putting up with crappy FM transmitters for the ipod :frowning:

You should ideally put a load on the dropper to check correct operation.Something like a 12v/75w lamp to draw some current and give the dropper some work to do,then connect your voltmeter to see what reading you get.(A voltmeter draws hardly any current).Careful you don’t burn yourself or anything else,though :wink: