View Single Post
Old 23rd Aug 2010, 10:46 pm   #15
Steve_P
Dekatron
 
Steve_P's Avatar
 
Join Date: Sep 2003
Location: Bolton, Greater Manchester, UK.
Posts: 6,644
Default Re: Old car radio - how to change polarity?

The only way to put a positive earth in a negative earth vehicle is to completely isolate the earths of the car and the radio.

The earth lead on the aerial must be isolated too. The performance of the set may not be as good because of this, but it's the only way. You can add a ground plane on the aerial but it must not touch the rest of the car.

Run the car radio straight from the car battery. Because the radio and car are separated electrically then it will work.

Cheers,

Steve P.
__________________
If we've always had it, why is the Car Boot open? You're not sneaking another Old TV in are you...?
Steve_P is offline