You can also use the "Search the Site" tool displayed in the left page margin! Looks like the "picture" attached below.
Click the link, enter a few words (something like: 6volt to 12 volt heater motor conversion). Will provide you a list of previous thread links that include discussions on the topic desired. Many have done similar things before and you most likely will find part or source info to help you out.
~ Dan 1951 Chevy 3 window 3100 Follow this story in the DITY Gallery "My Grandpa Carl's Truck and How it Became Mine" 1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver) US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)