Packard Forum Index » V-8 (1955-56)

I don't recall ever seeing any kind of sticker. Positive ground was the norm for other cars besides Packard. Most stations or repair shops just knew back then or had a chart to look at.

Unless the car has an unprotected solid state replacement component installed somewhere, there will be no damage done if it is hooked up backward. So many have been done accidentally or on purpose over the years and owners never knew anything was wrong. Indeed, many of them have come to light after the current owner has been on the forum asking what was correct having just discovered their car was "different" than what the manual said.

The only thing in an AM radio is the vibrator if it was replaced with a solid state version. If you are using the original one, then it should be just fine.