Possible reasons for glitchy electrics in a car:
Battery:
* Dead battery
* Loose or corroded battery terminals
* Faulty alternator not charging battery
Generator:
* Faulty generator
* Worn or broken alternator drive belt
* Break in the generator wiring
Starter:
* Faulty starter
* Worn or broken starter wire
* Slipping starter drive gear
Fuses and relays:
*Blown fuses
* Faulty relays
*Short circuit causing fuses to trip
Wiring:
* Broken, frayed or pinched wires
*Weak or damaged connectors
*Bad or corroded contacts
Electronic control units (ECU):
* Faulty ECUs (engine control modules, transmission control modules, etc.)
* Damage to the electronic circuits of the ECU
* Software glitches
Other possible reasons:
* Poor ground contact
* Grounding not in the normal place
* Damage from water or corrosion
* Overloading the electrical system (for example, installing too many additional devices)
Symptoms of a car electrical glitch:
* Dim headlights or no light
* Problems starting the engine
* Non-working appliances or electronics
*Blown fuses
* Strange sounds or blinking lights on the dashboard
* Excessive battery discharge or constant charging