Battery and jump leads

[QBee]

General question. 50/50 chance of guessing correctly, but which is actually correct? And why?

1. Disconnecting the battery - which terminal should you remove first?
2. Reconnecting the battery - which terminal should you attach first?
3. Connecting jump leads - which terminal, and which car, first?
4. Disconnecting jump leads - which terminal, and which car, first?
5. Battery charger - attach terminals before switching on and switch off before removing terminals?

[phillpot]

1.and 2. Earth off first, positive back on first is the way I was taught.

3. and 4. The important thing I believe is to connect one lead at a time rather than + and - to either battery first which would leave a pair of "live" crocodile clips.

5. Never ever connect or disconnect a battery charger while it is switched on. Batteries give off explosive fumes while being charged, connecting/disconnecting charger leads can create a spark.... can you guess the rest!

[Hoover.]

1. Negative off first
2. Positive on first
3. Positive on knackered car
4. Negative on knackered car
5. connect when charger is not on


no idea why, the way dad taught me after me casuing a big fire work display as I put wo crodile cli[s together after taking them off a car

ohhh and the potential damage to electronics/ecu......

[Chuffmeister]

As above, but fit yourself an anderson connector under the bonnet. saves crawling abound in the footwell...

[QBee]

Don't laugh, I was asking generally I know, but I never have trouble with my TVR. Hence no need for an Anderson shelter.

It's the Vorskin Durch Technik that's giving me the grief. If the battery gets a bit low the battery management system starts turning stuff off, then it deadlocks the car, disarms the remote control and immobilizes the car. Then it turns on the headlights and sets the alarm off at 3.45 am.

Sometimes I wish I had Chimpon's gas guzzler as my daily driver.......and didn't have to drive a diseasel Audi.

[Chuffmeister]

QBee said:

Don't laugh, I was asking generally I know, but I never have trouble with my TVR. Hence no need for an Anderson shelter.

It's the Vorskin Durch Technik that's giving me the grief. If the battery gets a bit low the battery management system starts turning stuff off, then it deadlocks the car, disarms the remote control and immobilizes the car. Then it turns on the headlights and sets the alarm off at 3.45 am.

Sometimes I wish I had Chimpon's gas guzzler as my daily driver.......and didn't have to drive a diseasel Audi.

There should be terminal connectors under the bonnet near the heater filter housing. No need to access the battery in the boot.

[Hoover.]

Chuffmeister said:

As above, but fit yourself an anderson connector under the bonnet. saves crawling abound in the footwell...

Unless the Anderson connector jump leads are in the boot

and as I found out yesterday having 2 red leads off the battery terminals could be very expensive, waiting on verdict tomorrow

[Hoover.]

QBee said:

It's the Vorskin Durch Technik that's giving me the grief. If the battery gets a bit low the battery management system starts turning stuff off, then it deadlocks the car, disarms the remote control and immobilizes the car. Then it turns on the headlights and sets the alarm off at 3.45 am.

My 15 yrs Jeep Grand Cherokee does something similar, and when the car is jump started the alarm keeps going off (approx. half hour of on off alarm) with the engine running until there is enough charge in the battery..... a right kerfuffle