General Maintenance & Repairs - Car electrical system shutting on and off rapidly

Sometimes my cars electrical system will start shutting off and on while driving very rapidly . the engine is also shutting on and off but it is very fast so you can still drive while it is doing it . Any ideas what this could be

Sounds like a ground issue. Check battery connections first. Beyond that I'm not sure.

Def a ground. Could be your battery. If not start checking all your grounds for each computer.