Have you ever bother about the right sequence to disconnect and reconnect the battery in your car? We need to do this when changing battery, installing gadgets such as voltage stabilizer, grounding cables, etc.
The right sequence to disconnect the cable from the battery terminals is:
1. Disconnect the -ve terminal first
2. Disconnect the +ve terminal then
To reconnect the cable to the battery terminals:
3. Reconnect the +ve terminal first
4. Reconnect the -ve terminal last
If it is done in wrong sequence, there is a chance of short circuit when the disconnected terminal accidentally touches the metal part of the car body, and there is possibility that sensitive electronic equipments in the car could be damaged.
There exist something called a "memory keeper" to be plugged into lighter socket, which will help you to keep the setting of radio, clock, etc. for a short period of time, while the battery is temporary disconnected.
We need to do this when changing battery, installing gadgets such as voltage stabilizer, grounding cables, etc. his comment is here
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