While the price is a downside, the size, burn time and no maintenance ( beating with a hammer) make it worth the cost.
No affiliation.
https://elementfire.com/pages/models
I bought my carpet from https://www.stockinteriors.com/items.asp?ModelId=88&MainCatId=1
Also bought the rear cab wall carpet. I'm happy with the quality.
Prior to laying down the carpet I used Noico 80 mil sound deadening mat from Amazon.
I'll be in Bakersfield on the 23 & 24 this month. If you still have the problem by then, I could swing by for an hour or so and help you with a voltmeter.
Since non oem badging is an option you can get whatever you like made up. Plenty of places online will do customs badges.
https://emblemart.com/newsite/
https://www.chromeemblems.com/
Also posted on CK5.com. This thread should have some good info and plenty of links. It's a rabbit hole.
https://ck5.com/forums/threads/need-urgent-help-2004-efi-8-1-ltr-engine-in-blazer-1981.283625/#post-2898583