Glad you found the problem! Did you buy a switch that is rated for use as a starter button? (15A or so... similar to this one?

http://www.delcity.net/store/Starter-&-Horn-Switch/p_793130



Mike
1955 Chevy 6400 ex-flatbed (no bed now!) sold September 2023
In the Stovebolt Gallery
1958 Chevy 6400 flatbed W/dump
In the Stovebolt Gallery
1959 Chevy Suburban Owned for almost 20 years, Daily Driver -- sold May 2016
In the Stovebolt Gallery

Sufficient unto the day is the evil thereof