On a 1956 ford is it negative or positive ground?

On a 1956 ford is it negative or positive ground?

I believe they were, but they are easy to reverse.

Positive to Negative Ground Conversion - SpriteSpot.com
www.spritespot.com/…/Positive%20to%20…
Positive to Negative Ground Conversion. Brought to you by SpriteSpot.com. Introduction. Many older British cars (Spridgets included) had positive ground.