Weird Electrical problem

Well I'm having a weird problem with my car, and I'm pretty sure it's electrical related. Basically what happens is after I start my car after it has been parked for a while and shift into reverse the car will stutter like it's going to stall, my head unit will turn off, the abs light will go on and the TCS will turn off. After about a second though they all turn back on...I got my alternator tested and the voltage is fine even with my subs on, but I think that it's having a hard time charging the battery at startup, or it has a bad ground. I honestly think it's either those, or my alternator rewire, ever since I put that on my car it's been acting fucked up. So what do you guys think? tia.
 
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