I found a spec at another forum that says: quote
"01-29-2013, 02:36 AM Report Post
I have these numbers saved in a text file, based on info posted on here and at STD over the last 10 years. I haven't verified them independently, but hopefully someone who knows for sure can corroborate or refute these
'87-'97 trucks: 22.5 ohms empty, 145 ohms full"---- unquote
maybe this helps ????