You also haven't checked for ground on the wires yet. Check all of that first. As for the speaker impedance being .01-.04, I think that your meter is measuring a higher scale of impedance. You need to find power for the red wire when the vehicle is turned on.

 

0.01~0.04V coming from your speakers should not be anything to worry about... it could be that the multimeter is not 100% accurate, or if anything is changing the air pressure and moving your speaker the smallest bit, it can read a voltage. Remember, moving a speaker back and forth causes it to generate electricity, much like turning an electric motor turns it into a generator.

 

Moving a speaker creates AC voltage not DC.
I know that my multimeter's display remains at zero if I have the wrong voltage selected. So if I'm looking for DC voltage and come across an AC source, my display remains blank.

One way to test if the voltage in the line is from the speaker is to test right at the speaker itself. Disconnect the wires from the speaker and test directly on the speaker terminals. if you get the same 0.01 - 0.04, then sirsleepsalot assessment is accurate and good. If you get something different there may be a problem on your speaker lines.

One other question - does the factory system use external amps?

 

maltesechicken is right about the AC and DC... I guess I'm too used to my multimeter that swaps from one to another automatically depending on what kind of voltage / current it detects.

But, with such small voltages, you may also simply be seeing induced voltage from nearby power lines in the car.

 

The system has no factory or after market amps. Also I was checking with DC voltage when I found those numbers. I also checked ground on the wires and they are all fine.

 

That's really handy. What make meter is that? I want one.
I have had a number of times that I've been repairing some electronics and searching for voltage so I can trace the problem . . . The joy of transformers is that you can have AC in a DC or DC in an AC. I would love it if my meter automatically switched (and told me) when I moved from AC to DC.

I'm currently using a Mastercraft DMM that's about 10 years old . . . I could use an excuse for an upgrade.

 

maltesechicken:
I've had Fluke's for a looooong time. They work really well!


ryan12345:
Have you found accessory? What do you mean all the wires are fine for ground? Does that mean that none of the speaker wires have any ground?

 

You said a different deck worked fine right? So, my question is...are the two decks different sizes, maybe one deeper than the other?

It MIGHT be possible (if one deck is larger) that it is pushing or scraping a speaker wire or something against the deck or chassis, causing a short, or even pinching two wires together.

Have a good look with a bright flashlight back there, maybe some bare wire will stand out.

 

I ended up just returning the thing. Thanks for your help though everyone. Just wasn't worth the hassle for me.

 

all that for this??? ^^^^^