The electrical system is 12-volt with negative ground.
The battery is charged by a generator, which is driven by a belt from the crankshaft pulley.
The starter has a freewheel clutch with preliminary engagement with the traction relay. When the engine is started, the traction relay moves the pinion, bringing it into engagement with the flywheel ring gear before the starter is activated. After the engine is started, the freewheel clutch prevents the transfer of engine rotation to the starter.
Battery Disconnection - Scenic Models
On Scenic models, the battery is located in a special compartment under the right front seat. To disconnect the battery, you must disconnect the positive battery cable in the additional terminal block. Access to the terminal is obtained after removing the cover (refer to the accompanying illustration).
If the engine is started using heavy gauge jumper cables and a booster battery, use the secondary terminal of the positive red connection, not the battery terminal directly. This also applies when connecting a charger.
Precautions
A more detailed description of the various systems is provided in the relevant Sections of this Chapter.
When working with electrical equipment, extra care must be taken to avoid damaging semiconductor devices (diodes and transistors) and avoid electric shock.
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Always remove rings, watches, etc. before working on an electrical system. Even with the battery disconnected, capacitive discharge may occur if the component's power terminal is accidentally shorted with a metal object. This may cause shock or severe burns.
Do not mix up the battery terminals. Components such as the alternator, electronic control devices or any other semiconductor circuit may be irreparably damaged.
When starting the engine using large-section cables and a starting device or a separate battery, you need to connect the plus to the plus and the minus to the minus. This also applies when connecting the battery to the charger.
Never disconnect battery, alternator, any electrical wiring or instrumentation while the engine is running.
Do not allow the engine to rotate a generator that is disconnected from the electrical system.
Never test the generator's functionality by shorting its output terminals to ground.
When working on the electrical system, make sure the negative battery cable is disconnected.
Before using arc welding on a vehicle, disconnect the battery, alternator, and components such as the electronic ignition control device and fuel injection system to protect them from damage.
Warning! If the radio in your car is coded, make sure you know the code before disconnecting the battery.