Enable all checkboxes that are checked JQuery

I want to enable all checkboxes that are checked.

I am disabling all checkboxes that are not checked, and want to also enable all checkboxes that are checked. I am doing the following:

$("table#tableElectiveModuleId input[type='checkbox']:not(:checked)").prop("disabled", true);
$("table#tableElectiveModuleId input[type='checkbox']:checked").prop("disabled", false);

All checkboxes are now disabled, even though I am specifying that those that are checked, must be enabled.

Am I using the wrong syntax, or what am I doing wrong ?

Thanks for any help.