Lamp-probe (with the contact-needle)

You can use it to check the presence of voltage in the circuit. The brighter the lamp is lit, the higher the voltage. The needle pierced the wire insulation under test. The other terminal of the lamp on the wire attached to the "weight" (the metal of the car). Warning: Lamp-probe consumes a lot of power, so is not suitable for inspection of electronic devices. This requires a voltage probe with LEDs.