Tony Antoniou wrote:
> That's why you disconnect the positive lead first, and reconnect it last.
There's a very compelling reason to disconnect the NEGATIVE lead first
and reconnect it last, and that's the fact that if the spanner you're
using to loosen the terminal happens to touch any grounded metal in the
vicinity, it will not short-circuit the battery. If a spanner touches
the positive terminal and the vehicle body while the negative terminal
is still connected, there will be a big burn up that will not be
pleasant.
Electrically (ie. from the perspective of any devices connected to the
vehicle's electrical system) there is no difference whatsoever which
terminal is disconnected first, so the negative or ground terminal is
the one to remove first for the above reason.
With regards to back-EMFs from relay coils, there have been many
accidental omissions of the diode by manufacturers over the years. In
some cases this can fry very expensive ECUs under normal operating
conditions, and has been the topic of several service bulletins.
-cb
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