You'll love this one! Bit of a headscratcher

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kernowmcrae

New Member
Joined
Nov 16, 2014
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23
Car
Mercedes CLK230K, Various Alfas
Hi all, good evening.

So... today has been a pretty successful day, until it wasn't...

I've been working hard insulating my V220 CDi, 2003 model, and have been taking great delight in refitting all the interior panels properly, compared to the half fitted mess that they were when we got the van,

However - I now have a VERY weird problem that I'm at a loss to solve!

Long story short, the van had a Kenwood stereo in it. I've done nothing, other than unplug the stereo, and plug it back in again. Now the stereo shows 'miswire' and powers off.

I connected up a new stereo system, and the moment I plugged in the speaker block on the ISO connectors (No power ISO plug in yet!) the right front speaker in the van started emitting a buzz/whine and no sound would be produced.

I have probed the speaker connector, and am getting around 11 to 11.5v DC across the positive and negative Front right speaker connector!!

1701456193121.png

I have already tracked back and undone the entire insulation job, removed all the trims in the back, and double checked my connections to the rear speakers- all is perfect as it should have been - nothing is out of place.

I'm baffled - how can DC power be getting to the front right speaker? why only 11.5 volts? Where do I start!

Hopefully someone out here has an idea.

On a possibly related note, the van tonight did something it has NEVER done, and flashed its indicators to indicate locked/unlocked! I think it's posessed.
 
I wouldn’t expect to see a dc voltage on the speaker connectors. This would normally suggest a short circuit coupling capacitor (electrolytic) in the output stage of the head unit/amp.
 
I wouldn’t expect to see a dc voltage on the speaker connectors. This would normally suggest a short circuit coupling capacitor (electrolytic) in the output stage of the head unit/amp.
Thanks ted, but to be clear, this voltage is present without the head unit connected - the voltage is coming from the van side...
 
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Ah, so it’s possibly from an amp then.
Sorry, I don’t think I can help further on that, but hope it gets sorted 👍🏻👍🏻👍🏻
 

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