Relay winding (with the generator running) is under the rectified phase voltage of the generator If the voltage between the terminal «30» generator and «weight» equal to 13.8-14.5 V, the rectified phase voltage is 5-7 V.
The relay contacts close the power supply circuit of the control lamp 6 (rice. 7-5). When the ignition is switched on, when the engine (and hence the generator) does not work yet, current flows from the battery through the contacts. The lamp is on.
After starting the engine and when the car is moving, the lamp should go out, since under the action of the rectified phase voltage, the relay armature should be attracted to the core and open the relay contacts.
If the control lamp does not go out after starting the engine and when the car is moving, then this indicates a malfunction either in the generator or voltage regulator, or a malfunction of the relay itself (winding break, etc.).
Data for verification
- Contact opening voltage, 13 V - 5.3±0.4
- Contact closing voltage, * V - 0.2-1.5
- Winding resistance at 20°С, Ohm — 29±2
* At a temperature of 25±5°С