Electrical Polarity - Positive Ground

Brian's (??) recent post got me to thinking about something I saw while reading archives recently. Someone had a question about an older vehicle with positive ground, and wasn't sure about something. Years ago, I had an old Triumph TR3 sports car that was 12VDC positive ground. Couldn't easily convert it - can't remember, but think it was something to do with ignition - but I badly wanted to put a stereo in the car, and, of course, no stereos were built for + ground. Solved it quickly and easily by mounting the stereo on a piece of plywood, and mounting the plywood to the metal. This isolated the stereo from the car, and I just ran + & - to the appropriate connections.

Lar.

If you do this be careful of the antenna ground. Most antenna's have a braided copper shield as part of the cable assembly. It is quite often terminated at both ends, the connector and antenna mounting surface. This will create a short on your now "floating" radio case. Make sure you find an antenna which has the shield terminated at only the connector end.

Regards, Mark