First of all clamping to the vehicle battery. you are not paying attention to the polarity, as the solder shield is only connected in parallel to the battery terminals
2. The burning neon indicates the correct connection
3. Carry out welding work
4. disconnect welding protection
CAUTION:
To gain confidence in modern vehicles with the internal battery and an additional battery tapping point in the engine compartment, it is recommended that a WP11 be fitted at both points.