1. Unscrew the light bulb and inspect it. If the filament is burned out, or the glass bulb does not sit tightly in the base, then such a lamp must be replaced.
To make sure that the lamp is working, proceed as follows: connect two wires directly to the battery poles and attach them to the lamp. Polarity does not play any role in this. One of the wires goes to the current contact, and the other to the lamp socket. If the lamp still does not light up, replace it. If necessary, restore reliable contact.
2. Insert the light bulb into place and turn it on if it is working. If the lamp does not burn, then by means of a control bulb check up power supply. To do this, connect a test light to «mass» (-). Other contact (+) touch the power plug or the power cable directly.
If now the control lamp lights up, but the lamp under test still does not light up, this means that the connection between the lamp and the «weight» (-). To check this, attach an auxiliary wire connected to the car body to the lamp socket. The lamp should now be on.
If there is no voltage on the supply wire, that is, the control lamp does not light up, then it is very likely that the switch is faulty. In this case, it is necessary «ring out» switch.
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