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It certainly doesn't hurt to disconnect the battery. However, aren't the instrument lights switched positive (unfused from factory, many are fused aftermarket), so unless you turn on the light switch, there should be no power to them. Are other connections at risk for short circuit? Eventually you need to apply power to them. I do not disconnect battery if working on switched circuits unless I'm in a tight, complex space. BTW, I have been burned once or twice.
Dave
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Dave McKenzie
1984 Carrera 3.2
1984 928S Automatic
2001 996TT
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