Bill, likely I missed it (digging through a whole pile of backlogged mail
after being out of town for a few days), but I didn't see a reply to this.
> On an original 1970 TR6, Standard Triumph AM radio ...
> positive or negative ground??
TR6 were all negative ground. Some earlier radios had switches to select
positive or negative ground, but I think by 1970 the switch would likely no
longer be present. TRs went negative ground in 1965, and as I recall were
one of the last cars to do so.
> There are three ( 3) wires coming out, two brown together like
> household power cords, and one (1) black ... I am thinking the
> two are speaker wires, and the black power using a case ground.
Seems reasonable to me. What happens if you put an ohmmeter between the
black wire and the case ? Does it change when you turn the power switch on
?
Are there any numbers or even a manufacturer name on the case ? I have some
old car radio schematics at home and might be able to look it up for you if
I knew some more details.
Randall
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