It used to be real common to put a (-) ground radio in a (+) ground car; back when British cars were still (+) ground. There's nothing wrong with it as long as you do it right. I still don't see how they ran a 12v player on 6v, but it might work -- some electronics use 4.5v transistors, so they are just stepping down internally anyway. I think the most likely explanation is just that the PO was totally clueless and didn't realize the truck was 6v.

BTW, the tough part of installing an isolated radio used to be finding speakers that aren't grounded on one side; you might check that too. Modern speakers are almost always ungrounded.

 

That absolutely right Ross, and one possibility that hasn't been mentioned here yet is that the radio NEVER worked. My PO installed so many hair brain items that he could never get working, that I can't count them (remember this is the guy who used the grease gun hose as a brake line!!!!!).

So, there's a very good possibility that this radio/player got installed, it either fried the POs fob too, or never worked, and he just left it in to fill the hole or to fix later!

J!

P I have worked on a few 6 volt vehicles where there was an extra 6 volt battery installed - either as a back up, or to hook in series to power a 12 volt bus and isolated 12 volt components!!

 

Well I removed the CRAIG 12 volt radio/8track today and no more hot key to the dash. I find a aluminum rectifier of ssome kind under the dash...Is this some kind of 12-6volt reducer?
Anyway--I will drive the truck awhile,and have a professional install another stereo,later. I do not want a round radio in the dash and there is no hole anyway.
MAN....I was hoping to jam to some of my old 8tracks that we dug out of the attic. Bummer!!
Thanks....Bill