Garland Gray II wrote:

Uh Larry, how can I determine whether it is negative ground?

Look at the battery. One of the two major cables from the two posts
will go to a ground like the engine block or the frame. On current cars
is is the negative (-) post.

Jack

--
Jack Erbes in Ellsworth, Maine, USA - jackerbes at adelphia dot net
(also receiving email at jacker at midmaine.com)