So, the car electrical system, is way more than, just the stuff you see under the hood.

Consequently, apart from the main charging, starting and ignition circuits, there are many other circuits.

All electrical circuits in vehicles, are opened and closed; either by switches or relays and fuses are used to prevent them from overloads.

The car electrical system, is very complex and has wires running off it; at intervals to connect with components that require power.

Many of these circuits power:

  • Lights.
  • Engine cooling fan.
  • The sensors and gauges, of electrical instruments.
  • Heating elements.
  • Magnetically operated locks.
  • The radio.
  • Fuel pump.

How Do We Measure This Information

So, modern cars have, a 12 volt battery. Consequently, a batteries capacity is measured in, amp/hours. So, a 56 amp/hour battery, should be able to deliver, a current of 1 amp for 56 hours. However, if the battery voltage drops, less current flows and eventually; there is not enough to make the components work.

Short Circuits And Fuses

So, the current in a wire, may become dangerously high and melt the wire or cause a fire. Therefore, to guard against this, ancillary circuits have fuses. The sudden surge of high current, in a short circuit; makes the fuse wire melt or ‘blow’, breaking the circuit. When this happens, check to see if there is a short circuit or a disconnection. Then install a new fuse, of the correct amperage rating. There are many fuses, each protecting a small group of components. So, that one blown fuse, does not shut down the whole system.


Choose Your Car Electrical System Help Topic Below

Automotive Car Battery – Provides The Power To Starter And Accessories

Automotive Relays – How They Work – Why You Need Them – Testing

Car Alternator – Feeds The Electrical System Once The Engine Starts

Car Starter Motor – How Do You Know If Your Starter Motor Is Failing

Sensors In Cars – Devices That Monitor And Control Engine Parameters

Automotive Fuses – If Any Electrical Item Fails – Check The Fuses First

Dash Warning Lights – Only Provide A Warning Something Is Wrong

Ignition Switch – Common Signs Of A Failing Ignition Switch


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