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Parts
Used Audi A4 Electrical Systems
All used Audi A4 Electrical Systems listed on Breakeryard.com are tested, original (OEM) manufacturer parts and come with a 14 day money back guarantee. Breakeryard.com list cheap new OES or aftermarket car parts at discounted prices or used OEM car parts up to 80% cheaper than main dealer prices for Audi A4 from premium breaker yards from across the UK.
About Electrical Systems
Getting into the details of the electrical system
The electrical systems on most modern cars consist of negative earth circuits. The main power source is the 12 volt battery and when the engine is running, the alternator. The systems run off a positive flow with a negative earth return through the body of the vehicle. On some older vehicles the system is run on a positive earth, but this is mainly on 6 volt systems.
A set of wiring looms, which is all the cables bound together which run through the vehicle and branch of where power is needed for individual components. In addition there is a heavier cable running the main charging, ignition and the starter motor to supply the high voltage required to turn and start the engine and keep the battery charged. The wiring for all the circuits in the car are of different thickness and amperage depending on the components power requirements. The wires are colour coded to enable tracing wires when looking for a fault. On modern cars with electronic control devices and components, printed circuits are widely used as they take up less space than a bunch of wires. The power source for the electrical systems is switched on via the ignition key/switch apart from the lighting system which is on a live feed to enable the lights to be used for parking. This ensures that the battery will not be run down when the car is left unattended.
The power source runs through a fuse box and relays, which protects components from damage due to electrical short outs. Apart from the starter motor most components run on 5 amp. 10 amp, 15 amp, 20 amp, 25 amp and 30 amp wiring and are fused according to the power requirements being carried on each wire. Components are activated through the ignition, relays and switches and with remote controlled devices through electromagnetic switches.
What if something goes wrong with the electrical system?
The most common faults with the electrical system involve the lighting system of the vehicle requiring the replacement of blown bulbs. In the event of a malfunction of any component, the fuses should be checked in the fuse box, normally located in the front footwells or glove compartment. This box has a labelled colour coded fuse array and individual fuses can be visually checked to see if it has blown. This serves as a starting point to resolving electrical faults.
Audi A4 trivia
- You can buy an Audi A4 as either a sedan or as a station wagon. However, the second and third generation A4 can also be purchased as a convertible.
- The Audi A4 is a good-looking car, so it’s not surprising to spot it in some big movies. Everything from Transformers to Pixels to Teenage Mutant Ninja Turtles have featured an Audi A4. It’s also been used in multiple racing games.
- The fifth-generation Audi A4 was unveiled at the Frankfurt Motor Show in 2015 and was both larger and lighter (by an impressive 120kg!).
- There have been five generations of the Audi A4, but it continues to be treated as the natural continuation of the Audi 80 lineage. This can make it very confusing to follow the design changes of the A4!
- The B4 and B7 versions of the Audi A4 all received the 4-star safety rating from Euro NCAP testers.