Had A Tough One Come My Way...

I have a friend who was asking me today how I would go about installing a stereo in an older car with positive ground...now, I am thinking to myself, can u just run a hot wire from the battery and ground the deck to the chassis as per usual? I dont know enough about positive ground and how it works to make a qualified decision...

any takers?

http://www.analyticsystems.com/products/converters/vtc120.htm

     Your going to need some sort of converter.  If you ran seperate wires to battery, you would have to isolate the chassis of radio from touching metal of car(ant. too), would be risky and not safe.  I did some 2 way radios in older Peterbuilt trucks, they also were positive ground and we used converters worked fine.   

In a positive ground vehicle, the positive terminal of the battery is connected to the vehicle's chassis with the negative side of the battery connected to the fuse panel, starter, etc. (just opposite of a negative ground vehicle)

Is it a 12 volt positive ground or a 6 volt positive ground vehicle? (old VW Bug maybe??) If it's a 12 volt positive ground vehicle, you'll have to completely isolate the chassis of the head unit from the vehicle's chassis and run both positive and negative leads to the battery (fused). If the speaker leads are common ground*, you'll need to rewire each back to the head unit. If the vehilce is 6 volt positive ground, you'll need a 6 volt to 12 volt inverter. You'll also need to isolate the antenna's (ground) from the head unit or even install an additional antenna that is not grounded to the vehicle's chassis/body.