Strange electrical problem

[Pesty]

Hi,

I have a dab radio in the car.

The Ariel gets power from the head unit and I've earthed it on the chassis. All been working fine for years.

Today I've fitted an add a circuit which connects to a 12v to 5v converter then onto a camera. I've earthed the 12v converter to the chassis.

Camera works but when it's on I get no radio signal. Head unit fine.

I'm assuming ( I know nothing) that the Ariel unit and the 12v unit being both earthed to the chassis is causing an issue somehow.

Any ideas? Thanks in advance.

[Pesty]

http://www.ebay.co.uk/itm/DC-12V-to-5V-3A-15W-Step...

This is the type of thing.

As soon as I unplug mini USB at camera side radio comes back.

Assuming there is some kind of interference I'm wondering if some kind of filter somewhere would help.

Both black wires from respective devices wired to an earth point on chassis. Wires in tact.

Edited by Pesty on Sunday 24th August 20:12

[Pesty]

Something like this before the step down?

http://www.ebay.co.uk/itm/TDK-ZJY51R5-2P-01-FILTER...


Getting way beyond my competence level I'll try a different earth point first.

Edited by Pesty on Monday 25th August 00:17

[Pesty]

Thanks Ill have a play.

They are only 2.99 cant i put them all three places