From the 986 Factory Manual:
Electronic control modules
Note!
Protection against overvoltage
To protect electronic control units from overvoltage during electric
arc welding, the following work regulations must be observed:
•When welding work is extensive, the electronic control units
must be removed. Ensure that there are no electrically insulated
parts between the earth connection and the welding point.
•Remove clamp from negative terminal of battery and cover negative
terminal of battery.
•Connect the earth connection of the electric arc welding equipment
as near as possible to the welding point on the part to be
welded.
•Do not touch electronic control units or electric cables with the
earth connection or the welding electrode.
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