When I got my first TR4 back in '86 . . . I was in the same scenario:
Positive ground car, wanted a stereo, and didn't know squat about
electricity.
(not that I'm a wiz now by any means)
I did buy a polarity converter at Radio Shack. I don't remember it being
expensive. I just remember that it made this awful high pitched squeal /
whine all the time.
It was a black box . .about the size of a coke can. I probably still have
it somewhere.
Other than the noise, it worked fine. Well . . actually the first radio I
had in there . .a 50w unit . . whenever I'd hit the brakes, or turn on any
other electrical device on the car .. the radio would blink off for a
second. Whether that was due to the converter or not . .I don't know.
I think a few years ago when this came up . . someone who is an electrical
wiz (Dave Massey maybe?) told me that the noisy version I had was replaced
by a more modern, version.
There's my data point.
Scott Tilton
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