So I changed my starter and hydro boost unit out this weekend and noticed today when I went to use my 05 suburban that turning the key to on turned the radio Head unit on right away like normal, and during the cranking it lost power like normal, but after the engine was running it took like a solid 2 minutes for the head unit to power back on. What could be causing this?

Are there fusible links down by the starter like the older gm vehicles?

 

Double check to make sure your battery cable to terminal connections are tight. Also, check that the little black wire from the negative battery cable that goes to the body is intact and that it has a good, clean and tight connection to the body.