Hello, Chad. Welcome to TechForum!
This looks like a DuPont-style connector. Check out our A34956-ND; how does this look for you?
18 AWG Wire
Apologies, this style of connector does not generally stretch quite to 18AWG. Do you happen to have a pitch measurement for the device, by chance?
Closest visual match I’m seeing however the contacts are 22-26 AWG.