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You(personally) need to test to see if the ground stud has continuity to the case(exterior). This is how you test for isolated ground. Have you? If you have made smoke appear anywhere since installing them, all previous testing is invalid.

Not sure how you tested the alternators but you need to understand that a standard "bench test" will not always find a bad diode trio. A bad diode trio will drain the battery when the vehicle is not running. It can still pass the charge"output test" with a bad diode trio. Also, did you test...

You may only have a burnt fusible link, if we're lucky!

Where did you see smoke?

How about the part numbers and where they are stamped. Is the Delco Remy TM cast into the(on the rear I think it is)

Look over your new ones and compare them to the originals, I doubt they sell OEM AC Delco alts(I know what their ad says).

Search our site for rare electric and see what you find. There have been a few people that have reported the same failure as you, after buying their alternators. Testing them or any alt before installing them is imperative.

What alternators did you order? Are they isolated ground? Did you test them? Why didn't you just rebuild your original alts? This is a much better choice in my opinion. Is there a thread about your truck not starting?

Replacing that suppressor(diode) with a wire would create a dead short from 24+ to ground. You do not need it.