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ABS Control unit

Here again ... '88 5kCSQW

I've been dealing with a solid on ABS light for a little while now ... 
so I thought I'd try to resolve it before the trip.  I had already 
attempted a swap of the power relay from a working car to no avail.  
Bentley also states that it is important to have the D+ line from the 
alternator connected.  I confirmed this voltage looks good last night.  
I checked the resistance of the sensors per Bentley as well ... all 4 
look good.  The symptom is that when the car is started the ABS OFF 
light never turns off, so I don't suspect any sensors in any case.  
I'm getting to the point that I'm thinking its a problem inside the 
ABS control box.  Has anyone out there delved into one of these?  If 
so, are there any fuses or other known failure points inside?

TIA for any experiences!

Steve Buchholz
San Jose, CA (USA)