Audi 80 Quiz
Body Electrical System

Negative to Ground

In this manual: Body Electrical System
Technical Description — 39Engines — 41Exhaust System — 13Cooling System — 28Fuel tank and fuel pump — 12Air Filter and Intake Ducts — 13Mono-Motronic Injection System — 18Digifant Injection System — 19KE-III-Jetronic Injection System — 35MPI and MPFI Injection Systems — 32Clutch — 11Transmission and Driveline — 21Suspension and Steering — 33Brake System — 41Anti-lock brake system — 8Wheels and Tires — 13Body Electrical System — 35Ignition System — 24Lighting — 14Signaling Devices — 7Instruments and Auxiliary Equipment — 54Heating and Ventilation — 7Body Components — 18Troubleshooting — 6Specifications — 13
~1min read

Power is supplied to electrical consumers by a wire that is always connected to the battery, in more or less complex ways, as can be seen from the wiring diagrams in the next chapter.


The return circuit is provided by electrically conductive metal parts of the body or engine. This saves a large amount of expensive copper cable. In most cases, however, a short length of cable is still required for the return circuit, namely where the electrical consumer is not located directly on metal. For this purpose, a certain number of so-called ground points are distributed throughout the body.


The negative terminal of the battery is, of course, also connected to the body, or 'ground', as auto electricians say. So remember: 'negative to ground'.

Test yourself

A quick Audi 80 quiz: every answer comes with an explanation and a link to the manual page.