There's two things I can think of you might wanna check... Firstly, that HU has a power setting that's user definable. I would check that setting per your manual for your specific setup and make sure it's right. All that does is to make sure if you are not using the internal power amp section of the HU, it turns off the speaker-level outputs. Ground fault issues can be caused by that in some cases. Then the other thing to try is that your HU also has a power antenna turn on lead. Have you tried that to see if it will power up the amp without triggering a ground fault? Either way, something is triggering ground fault protection. Where is your ground wire from the amp grounded to? Usually, you want the ground wire to be as short as possible...however, it might need to be grounded directly to the battery for the best overall connection. Just throwing out ideas for you to check off the top of my head...
Sorry if that's not much help. Good luck.
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2015 CVO Road Glide Ultra, 110" Screaming Eagle, Twin Cooling, Removable Tour Pack