Car jump starting..earth point? - Page 3

BigRuss · 7th November 2018, 14:58

I've connected and disconnected the batteries on these cars literally hundreds of times and have never had any issues.
The problem only seems to happen when using booster packs or jump starting.

Russ

tourer · 7th November 2018, 15:52

Quote:

Originally Posted by BigRuss

I've connected and disconnected the batteries on these cars literally hundreds of times and have never had any issues.
The problem only seems to happen when using booster packs or jump starting.

Russ

Thanks for that, Russ.

MSS · 7th November 2018, 17:55

Quote:

Originally Posted by BigRuss

I've really lost count of the many instrument packs I've had to sort out after people have "jump started" their cars the usual one is the 999999 issue due to a voltage spike.

Then the instrument pack needs stripping, eeprom reprogrammed, reassembled and then configured correctly on T4.

My advice take it or leave it, is unless it's really absolutely necessary is to avoid using a battery or booster to start a car take the battery off and charge it

Often it doesn't take too long to get enough charge in it for it to start a car.

Russ

Russ - do you know whether any of the cars that suffered from spike damage had been jump started using a power pack?

My personal order of choice is based on avoiding connection/disconnection to an operational alternator as much a possible in order to reduce the likelihood of a spike resulting from inductive or regulation components reacting to the sudden load changes. So, circumstances allowing, my order of preference for starting a car with a discharged battery is as follows:

1. Remove battery, charge, reconnect.

2. Use an intelligent maintenance type charger in situ for a few hours.

4. Use my spare fully-charged battery as a source for a jump start.

5. Use a power pack as the source.

6. Jump start car to car, with the donor car's engine switched off.

AndyN01 · 13th November 2018, 08:33

And here is the reply from the AA:

"Thank you for your email. It has been logged against the above Service Request Number.

I can confirm our Motoring Department have advised, as far as they can see, the two instructions are consistent:

Donor vehicle has good battery
Your vehicle has dead battery

1. Red to good +
2. Red to dead +
3. Black to good -
4. Black to dead earth
5. Black from dead earth (yours)
6. black from good - (other)
7. Red from dead + (yours)
8. Red from good + (other)

If you require any further assistance, please do not hesitate to contact me."

So there we have it.

I'm somewhat confused about why they didn't just give the instructions from 1 to 8 as that is easy to follow?

Andy.

7th November 2018, 14:58	#21
BigRuss Premium Trader 75 CDT Tourer,2.5 Launch Saloon, Omipro MG/Rover (T4) Join Date: Jul 2007 Location: Liversedge, West Yorkshire Posts: 5,405 Thanks: 1,105 Thanked 1,340 Times in 661 Posts	I've connected and disconnected the batteries on these cars literally hundreds of times and have never had any issues. The problem only seems to happen when using booster packs or jump starting. Russ __________________ Replacement Key Service http://https://the75andztclub.co.uk/...d.php?t=244732 Full T4 Testbook diagnostics available. Diesel ECU repair and replacement. Options enabled or disabled as required. Diesel X-Power 135 and 160bhp, Rover 1.8T 150 to 160 MG 160 V6 to 177 upgrades available P.M. for details.

13th November 2018, 08:33	#24
AndyN01 This is my second home Toyota RAV4 Join Date: Jun 2017 Location: Tamworth Posts: 3,070 Thanks: 2,478 Thanked 1,579 Times in 968 Posts	And here is the reply from the AA: "Thank you for your email. It has been logged against the above Service Request Number. I can confirm our Motoring Department have advised, as far as they can see, the two instructions are consistent: Donor vehicle has good battery Your vehicle has dead battery 1. Red to good + 2. Red to dead + 3. Black to good - 4. Black to dead earth 5. Black from dead earth (yours) 6. black from good - (other) 7. Red from dead + (yours) 8. Red from good + (other) If you require any further assistance, please do not hesitate to contact me." So there we have it. I'm somewhat confused about why they didn't just give the instructions from 1 to 8 as that is easy to follow? Andy.