Mercedes C-Class

1. If you found malfunction in system of charging — malfunction of the generator cannot be the only cause. Execute the following checks:

a) Examine a driving belt and be convinced that it is tense and is not damaged. At detection of damages replace it (address the Head Routine maintenance).
b) Make sure that bolts of fastening of the generator are reliably tightened.
c) Check conducting of the generator and all sockets. All contacts have to be reliable and not oxidized.
d) Check the corresponding safety locks located in a motive compartment (address the Head Onboard electric equipment). At detection burned down remove the cause of burn-out of a safety lock and replace it (at burn-out of the corresponding safety lock you will not be able to start the engine or to include any of devices).
e) Start the engine and be convinced that from the generator foreign sounds are not distributed (whistle or squeal can signal about malfunction of bearings or wear of brushes).
f) Make sure that the rechargeable battery is completely charged. If one of cans is damaged, the rechargeable battery can consume excess current.
g) Disconnect tips of wires from the rechargeable battery (at first negative). Examine plugs of the rechargeable battery and tips of wires. At detection of traces of corrosion carefully clear them (address the Head's materials Routine maintenance). Attach tips of wires to plugs and reliably tighten.
2. Turn on the voltmeter between positive and negative poles of the rechargeable battery.
3. Start the engine. Tension at start of the engine can fall to 8 V (at an external temperature of +20 °C).
4. Increase engine speed to 3000 rpm. Tension at the same time has to make from 13 to 14.5 V. Eto points to normal operation of the generator and regulator of tension. The generator tension (onboard tension) has to be higher, than the working tension that the battery at the movement of the car was again charged.
5. Check stability of operation of the regulator of tension. For this purpose turn on driving beam and repeat measurement at 3000 rpm. The received tension should not be above earlier received value more than for 0.4 Century.
6. If the received value lies outside a preset value, take the generator and the regulator to repare on HUNDRED.