Jul 11 2021, 05:03 PM
QUOTE(danny_sp15 @ Jul 11 2021, 04:16 PM)
I tot just take out negative, take out positive, change battery, then put back positive, put back negative? This is what i did and luckily no issue.
I think danger is when u start the car and then remove the negative to check alternator. This one should be done by a voltmeter instead.
I think danger is when u start the car and then remove the negative to check alternator. This one should be done by a voltmeter instead.
QUOTE(Roman Catholic @ Jul 11 2021, 04:38 PM)
That out to be the way but there are occasions when it is not eg
1. Incorrect use of jumper cables leading to burnt ECU / TCU
2. Different car makes different procedures like in some Peugoet its remove positive first then the negative etc
3. Client interferring during installation eg a client was so eager to get back that he started the vehicle without my approval which ended up blowing a few fuses luckily.
Old cars without many electronics easier but newer cars dont play play, later cannot start. Then must call tow truck to SC etc etc.
The reason for removing the +ve first is that the whole car body is -ve. Removing the +ve side of the battery can ensure that even if the dangling +ve wire touch any part of the car body accidentally, there is no electrical short. It is just logical step as extra precaution though not mandatory.1. Incorrect use of jumper cables leading to burnt ECU / TCU
2. Different car makes different procedures like in some Peugoet its remove positive first then the negative etc
3. Client interferring during installation eg a client was so eager to get back that he started the vehicle without my approval which ended up blowing a few fuses luckily.
Old cars without many electronics easier but newer cars dont play play, later cannot start. Then must call tow truck to SC etc etc.
In olden day, there are few car model that has +ve body (+ve side of battery connected to car body). Not sure if there is still car having that configutration nowadays.
The problem with modern cars is that some setting are lost when battery is removed. When battery is weak, you may not able to start the car but there is still power left in battery to retain the setting. Therefore, mechanic will jump a cable to external battery to keep the memory setting before removing the battery. Put new battery and only then remove the temporary external battery. Some just jump start the car with external battery or with other car, By leaving the engine on, the memory setting is retained even when the old battery is removed because alternator is taking chage to power the car when engine is running.
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