Hey,

Ive installed a new double din stereo due to the dvd screen previously in the car going to the shitter.

But when i go from parkers to headlights on the radio goes all fuzzy and now ive picked up on it doing it when im jsut driving noramlly,

Is it soemthing with the radio frequency inside the headunit itself or is there a fault in the car,

I though maybe whoever installed the HID kit has disrupted the the circuit,

Can anyone give some pointers on solving the issue?

Nathan

Is your aerial getting power, as there is a preamp in in that needs power to boost the signal?

..and the only thing I know is that there should be capacitors in the circuit to take the voltage spikes out otherwise they cause a radio to crackle. Usually on the back of the alternator, which you shouldn't have needed to touch.

Take your radio out and make a new earth on the body some where

Just to clarify, you have taken out the factory head unit or was it an aftermarket unit, which was working ok ?

If it was ok did you change any wiring when you put the new unit in, I suspect you would have as most aftermaket units need different adpaters.

I would suggest recheck the wiring and in particular ensure that the ANT BATT lead is connected to Battery +ive, best point is via ACC this powers the roof aerial.
Check all grounds are connected.

In most cases people remove their Factory Head Unit and forget the ANT BATT connection which causes crap reception.

i also noticed this on my A/M head unit after installing HIDs in my fog lights. the HID wiring is not located anywhere near any of my head deck wiring. so am finding it a little confusing

I've not used HIDs does anyone know if perhaps they give off any signal at a particular frequency that could upset a Head Unit ?

Perhaps feedback in the power rails ?

The reason you experience static when using HID's is the ballast that you are using to power your 35W output is an extreamly high switching tension voltage that induces into your car body, which is your anntennas earth refference aswell. If your refecernce changes then so does the impedance of your antenna and you head unit will struggle to latch onto your desired frequency. Often what you can do is to make a better earth to your car body straight from your headunit/amplifyer, next step is to filter your earth with a passive noise filter next step is get better ballast which employs a better emi filter.

You can also filter your antenna but I havent seen how the antenna is installed yet underneath the roof skin and this has a drawback of less reception...

wow sweet thanks! you know your stuff or just did more research on it than i did (which was none :P)

will try earth the head unit or amp when i next take mt car apart or if it gets really bad.

Fix medical equipment for a living mate :) Also fixed aircraft electronics in the air force so I know a bit lol

okay so im gonna go home and grab the earth wire from teh head deck and find a better spot for it ??

OK so the HID's are creating the interference, how about installing filters in the power feed to the Head Unit
http://www.jaycar.co.nz/productView.asp?ID...rs&form=KEYWORD
40 amp units are also available.

Earthing at the HID and Head Unit also, but remember the problem has been introduced by the HIDs not the Head Unit

These line filters are basicaly capacitors that have a really high capacitive reactance circut that filter noise by shunting the AC noise. Really effective but they are supplied in almost every aftermarket headunit loom and I would be extreamly supprised if it doesnt. These are mainly for pre 90's cars as most modern cars have line filters anyway.

Yes the HID's are causing the problem as I mentioned BUT the problem is the HID's are inducing noise into the car body which is your earth/reference point. (Will induce into your power side also but as I just said the sensitive fuse outputs are filtered). A weak earth will make the problem worse and if its generaly when your listening to your radio then the problem exists with your anntenna not getting a stable reference eg a 0VDC ground point (your car body)