Radio Interference Query (Jeff ?)

directstep · 26th November 2016, 09:29

Just installed a new system in one of my ZTs, but this problem was also happening with the oem system before.

On AM radio, the usual interference etc, it's a lot worse than on my other ZT.

Interestingly, if I touch/press the brake pedal the noise subsides to almost nothing. I get the same effect if I turn on the car lights as well.

Any ideas please?

Blackrose · 26th November 2016, 12:39

Something to do with the alternator load ???

Blackrose

coolcat · 26th November 2016, 13:00

Try running another earth from the case of the radio to a known good earthing point on the car body .

See if that makes any difference

directstep · 26th November 2016, 13:17

Quote:

Originally Posted by coolcat

Try running another earth from the case of the radio to a known good earthing point on the car body .

See if that makes any difference

That was tried before but made no noticeable difference, but will get that re-checked to be doubly sure.
Everything was checked and identical to the other ZTs - only difference this car has an earthing strap? going up one of the bonnet struts....

kc13661 · 26th November 2016, 15:17

I recently noticed that I was getting excessive interference on the radio, turns out that the USB socket I had wired in to an ignition live is on the same circuit as the radio ignition live, all fine, until I plugged in the dash cam....

Will be a simple fix.......... next time the radio is removed

26th November 2016, 09:29	#1
directstep Loves to post MG ZT 190+ Join Date: Aug 2009 Location: Bristol Posts: 398 Thanks: 109 Thanked 51 Times in 45 Posts	Radio Interference Query (Jeff ?) Just installed a new system in one of my ZTs, but this problem was also happening with the oem system before. On AM radio, the usual interference etc, it's a lot worse than on my other ZT. Interestingly, if I touch/press the brake pedal the noise subsides to almost nothing. I get the same effect if I turn on the car lights as well. Any ideas please?

26th November 2016, 13:00	#3
coolcat This is my second home Audi Q3 TDI S-Line Quattro Join Date: Jul 2007 Location: Clacton On Sea/On the boat somewhere Posts: 51,171 Thanks: 9,890 Thanked 12,235 Times in 8,232 Posts	Try running another earth from the case of the radio to a known good earthing point on the car body . See if that makes any difference __________________ Jeff.

26th November 2016, 15:17	#5
kc13661 I really should get out more....... Freelander Td4 Join Date: Jan 2013 Location: Gateshead Posts: 2,332 Thanks: 704 Thanked 909 Times in 419 Posts	I recently noticed that I was getting excessive interference on the radio, turns out that the USB socket I had wired in to an ignition live is on the same circuit as the radio ignition live, all fine, until I plugged in the dash cam.... Will be a simple fix.......... next time the radio is removed __________________ ------------------------------------------------------------------- Growing old is compulsory.... Growing up is Optional

26th November 2016, 12:39	#2
Blackrose Loves to post Rover 75 Saloon Join Date: Apr 2015 Location: Stockton - On - Tees Posts: 367 Thanks: 55 Thanked 119 Times in 88 Posts	Something to do with the alternator load ??? Blackrose