- the negative terminal of the battery must always be connected to the case, and the positive terminal must be connected to the terminal "30" (9 - see figure 127) of the generator. An erroneous reverse connection of the battery will immediately cause an increased current through the valves (rectifier block diodes) generators and their failure to work;
- it is not allowed to operate the generator with the battery disconnected from the terminal "30". This will cause short-term overvoltages on the terminal "30" of the generator, which can damage the voltage regulator and electronic devices in the vehicle's on-board network;
- it is prohibited to check the generator's performance "for a spark" even by briefly connecting the "30" clamp of the generator to the housing. In this case, a significant current flows through the valves and they break down. The generator can only be checked using an ammeter and voltmeter;
- generator valves must not be tested with a voltage higher than 12 V or with a megohmmeter, as it has too high a voltage for the valves and they will be broken during testing (a short circuit will occur);
- the insulation resistance of the generator stator winding should be checked with increased voltage only on a bench and necessarily with the terminals of the phase windings disconnected from the valves;
- it is prohibited to check the vehicle's electrical wiring with a megohmmeter or a lamp powered by a voltage of more than 12 V. If such a check is necessary, then the wires should first be disconnected from the generator;
- when electric welding car body components and parts, you should disconnect the wires from all terminals of the generator and battery.
Possible generator malfunctions, their causes and troubleshooting methods are given in table 19.