Speakers were not grounded from the factory.  Beware if this is the case.

Jaime

On Saturday, June 20, 2015, fmiser via Mercedes <mercedes@okiebenz.com>
wrote:

> > Meade wrote:
> >
> > I'm concerned because I've read in several forum posts that
> > modern radios don't like how Mercedes grounded the speakers
> > in the 80's, now I need to see how the Becker 1492
> > installation compares to my 87 wagon, maybe in '94/'95
> > Mercedes continued with its speaker grounding method and
> > the 1492 won't care.
>
> Ah.  They grounded one side of the speaker line - huh?
> *shakes head*  Not a good idea.  Oh well.  It is what it is.
>
> You might be able to test your 1492 with a meter.  Measure
> the resistance between the various speaker "-" terminal.
> Also measure from the "-" terminal to chassis ground.
> Probably should check both polarities.
>
> Compare that to the same test procedure done with the "+"
> terminals.  If the amp output is NOT ground referenced, the
> two could be similar.  I don't know what values to expect.
>
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-- 
Jaime Kopchinski
http://www.jaimekop.com/
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