Thank you guys for all your help. In the end, it was the fuses in the Z4000 for the fixed circuits--they were tripped, so now all seems to be back and functioning. I'll order the cables now for the upgrade. Here's one last question, since I've learned I have the original model TIU-- is there any benefit to installing an external fuse on any of the connectors for the TIU, since there aren't any internal fuses on my model? Thanks again.
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