I believe the later turbo Mk II's all had afterglow. I know my AAZ-style GP controller definitely does.
Here is a picture of the offending part. Now the truck is running as good as never.
Good deal Tom!! IF you didn't already, grab a few spares of those fuse strips.. They don't typically blow often, just at really inopportune times...
Thanks Max for your help. You were right on the money!