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        General >> Give/Need advice to/from others >> Jump starting
        
(Message started by: micky5 on Jul 26^th, 2010, 2:58pm)

Title: Jump starting
Post by micky5 on Jul 26^th, 2010, 2:58pm

Hi, i was reading on here about jump starting a Scorpio...
do u have to connect the leads battery to battery, or a diff. way on a Scorpio
thks in advance

Title: Re: Jump starting
Post by Highlander on Jul 26^th, 2010, 3:31pm

Hi Micky,

Battery to battery jumping gives a greater risk of battery explosion/electrical damage

I've jump started many Scorpios without problems, as long as you use the following procedure when connecting the leads you should be fine.

1. Flat battery +ve
2. Good Battery +ve

3. Flat battery Ground (engine mount/earth only use the battery terminal as a LAST resort)
4. Good battery -ve

and the reverse when removing them

The safest way is to connect the leads when both engines are off, start the booster cars engine and allow the alternator to charge the dead battery for a while, then stopping the booster engine and removing the leads before trying to start the other car.

While starting a car with a dead battery when connected to a running booster engine is easier and provides more power it can blow the booster cars alternator diodes or significantly reduce their life.

If you do use this method make sure everything electrical is turned off on the vehicle with the dead battery

I've stood alongside people waving live jumper leads around and sparking them together but having experienced a forklift truck battery explode at close range its not something I would ever try myself ;)

Title: Re: Jump starting
Post by micky5 on Jul 26^th, 2010, 3:48pm

Thank You Highlander for your great help, much appreciated,

Title: Re: Jump starting
Post by Highlander on Jul 26^th, 2010, 3:53pm

One weird thing I have discovered which appears to affect only Scorpios is that sometimes jump starting will not start a Scorpio, the engine will crank fast but it just wont fire.

however if you take the battery out and charge it or replace it with a good one it fires up no problem.

I usually use a large heavy duty 4x4 or Van when jump starting and I have home made heavy duty jump leads which have started HGV's, tractors, forklifts etc so thats not the problem.

i've never worked that one out yet! ;)

Title: Re: Jump starting
Post by Mike H on Jul 27^th, 2010, 1:51pm

Basically what Highlander said.

This is interesting, from my owner's manual:

1. Position the vehicles so that they do not touch one another.
2. Switch off the engine. Switch off any unnecessary electrical equipment.
3. Connect the positive terminal of the flat batery to the positive terminal of the booster battery.
4. Connect one end of the second lead to the negative terminal of the booster batery and the other end to a metal part of the engine to be started not to the negative terminal of the flat battery (original bold print, not mine)
5. Makes sure that the jump leads are clear of moving parts of the engine.

To start the engine
1. Run the engine of the vehicle with the booster batery at moderately high speed.
2. Start the engine of the vehicle with the flat battery.
3. Once the engine has been started, run both vehicles for a further 3 minutes before disconnecting the leads.

To disconnect
1. To reduce voltage peaks on disconnection, swithc on the blower and heated rear window in the vehicle with the flat battery.
2. Disconnect first the negative lead then the positive lead.

Elsewhere it says, you must not attempt a push start or tow start if the engine is hot, as that kn*ckers the catalytic converter. Automatics you can't push start anyway.

Title: Re: Jump starting
Post by Highlander on Jul 27^th, 2010, 3:04pm

on 07/27/10 at 13:51:24, Mike H wrote:

4. Connect one end of the second lead to the negative terminal of the booster batery and the other end to a metal part of the engine to be started not to the negative terminal of the flat battery (original bold print, not mine)

Now see I would say that was wrong, if you connect the booster side first you now have an unconnected jump lead which could short on any part of the dead cars bodywork as you move to connect it. (Potential battery explosion).

I'm splitting hairs I know ;D

Title: Re: Jump starting
Post by gozz on Jul 27^th, 2010, 11:00pm

1. Position the vehicles so that they do not touch one another.
Won't matter much with plastic parts eh !
GOZZ.

[/quote]

Title: Re: Jump starting
Post by Mike H on Jul 28^th, 2010, 3:46pm

Zzzzzzt.....

on 07/27/10 at 15:04:38, Highlander wrote:

http://livinginthepast-audioweb.co.uk/kbf/th_shrug.gif I didn't write it!

Anyway confirms the bit about putting negative side on the actual engine