Hi,
ERR_TOO_MANY_REDIRECTS error messages %99 of the times are caused .htaccess file. Can you please check your .htaccess file and make sure you don't have any EXTRA/CUSTOM rules in it?
Also, if you don't have SSL certificate installed. Make sure to disable Force SSL option in the Joomla Backend > Global Configuration
Probably, your joomla is trying to redirect the page CART page to HTTPS:// protocol but since it doesn't exist, it bounce back to HTTP://, then trying to redirect to https again and it bounces back again.. and on and on.. so it keeps looping, caused ERR_TOO_MANY_REDIRECTS error message.
Regards.