I'm back today.
I checked blue to ground on each network:

Group serial(P5) = bounce around 50Hz to 73Hz. I noticed sometimes the Hz will bounce up to around 600. After a while it goes to 0 and stays there

Hall Serial(P3) = stays consistently at 554Hz

Car Serial(P8) = 1200Hz

I'm trying to isolate the risers but so far nothing is consistent. I read AC ln the rsl and i got 0.7V on both my group and hall rsl. I had nothing on my car


J. Clark