Earth or not?

[anditover]

Please can you help, I am installing my amp and sub-woofer and have found the installation kit to be fantastic. I am just a little stuck with one thing and hope you may be able to advise me please?
I need to attach the blue earth lead which runs from the amp to the cd header unit and i am not certain which lead is the earth on the header unit. JVC have been there unhelpful selves. the model is KD-LHX551 I was advised to join the blue earth lead you supply to the blue lead comming from the header unit. This however is listed on the top of the unit as "REMOTE(MAX 200mA)"
The black lead is listed as Ground.
Please can you help me or point me in the right direction?
Regards
Andy Buhlman

 

[television]

I would earth the amp to the nearest metal part of the car, and check to see if the amp makes a humming noise from the speaker, you can do this by turning on and just hold the earth lead to a metal part, if the is no hum or buzz join it to there and leave the head unit that normally grounds by the metal case.

This is whats known as a hum loop possible problem where on all audio gear all earthing points are taken to a common point to avoid a hum loop, if the head unit says black earth you can take it to that point, but as said if no hum, ignore it

 

[GRAV888]

STOP!!!!!!!!!!
The blue lead from the amp is not an earth.
DO NOT connect the blue lead to the earth.
It is a remote trigger lead that tells the amp when to switch on.
Connect it to the blue lead from the head unit marked REMOTE.

 

[Hornet]

Yep it is a 12v live switch wire to activate said amp, do not connect to ground / earth.

Usually you can simply ground / earth an amp as close to the amp as possible directly to the chassis, if you hear a buzz as mentioned above, you need to use a common ground (also known as a ground loop).

HTH

H

 

[anditover]

thanks people it makes sense now

andy