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Author Topic: Foolish jump lead connection  (Read 6713 times)

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f3nt0n

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Foolish jump lead connection
« on: 04 February 2014, 18:36:34 »
I recently tried jump starting my VW Golf (flat as a pancake) with my Omega. Made a real rookie mistake - connected the + to - across the two batteries. Tried to start the Golf, the Omega nearly conked out and the Golf smelt of burning (a bit). Realised my mistake and after much cussing at the stupidity of me, reconnected (the right way round) and the Golf started first time. BUT the Golf battery light is on and it conks out as soon as the jump leads are disconnected. The alternator is no longer spinning round.

I've !&!*ed the alternator on the Golf, haven't I?
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Yasmine Lee

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Re: Foolish jump lead connection
« Reply #1 on: 04 February 2014, 18:38:34 »
in a word

yep
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martin42

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Re: Foolish jump lead connection
« Reply #2 on: 04 February 2014, 18:46:16 »
Is the auxiliary belt still on the alternator?
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tidla

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Re: Foolish jump lead connection
« Reply #3 on: 04 February 2014, 19:08:13 »
The pulleys on vag brands do fail resulting in the alternator freewheeling and eventually falling off. Probably why it went flat unless you know other wise?

If the battery is that flat then it will stall. bench charge, refit and test charge rate.
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Andy B

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Re: Foolish jump lead connection
« Reply #4 on: 04 February 2014, 19:11:51 »
Quote from: f3nt0n on 04 February 2014, 18:36:34
.. The alternator is no longer spinning round.
.....

 ??? ??? Not sure what you mean ..... is the 'fan belt' still intact?
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f3nt0n

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Re: Foolish jump lead connection
« Reply #5 on: 04 February 2014, 19:48:24 »
Quote from: The Mad mechanic on 04 February 2014, 18:46:16
Is the auxiliary belt still on the alternator?

Yep, nice and secure.
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f3nt0n

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Re: Foolish jump lead connection
« Reply #6 on: 04 February 2014, 19:49:17 »
Quote from: tidla on 04 February 2014, 19:08:13
The pulleys on vag brands do fail resulting in the alternator freewheeling and eventually falling off. Probably why it went flat unless you know other wise?

If the battery is that flat then it will stall. bench charge, refit and test charge rate.

It went flat (I am supposing) because it sat around without being used for a year. Cheers.
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f3nt0n

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Re: Foolish jump lead connection
« Reply #7 on: 04 February 2014, 19:51:08 »
Quote from: Andy B on 04 February 2014, 19:11:51
Quote from: f3nt0n on 04 February 2014, 18:36:34
.. The alternator is no longer spinning round.
.....

 ??? ??? Not sure what you mean ..... is the 'fan belt' still intact?

I might be wrong but I thought that inside the alternator, the 'wirey bits' spin round while charging the battery. They don't spin any more (if they did in the first place). Thanks.
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henryd

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Re: Foolish jump lead connection
« Reply #8 on: 04 February 2014, 20:16:30 »
Quote from: f3nt0n on 04 February 2014, 19:51:08
Quote from: Andy B on 04 February 2014, 19:11:51
Quote from: f3nt0n on 04 February 2014, 18:36:34
.. The alternator is no longer spinning round.
.....

 ??? ??? Not sure what you mean ..... is the 'fan belt' still intact?

I might be wrong but I thought that inside the alternator, the 'wirey bits' spin round while charging the battery. They don't spin any more (if they did in the first place). Thanks.

No the wirey bits stay still  :y
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Andy B

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Re: Foolish jump lead connection
« Reply #9 on: 04 February 2014, 20:34:38 »
Quote from: f3nt0n on 04 February 2014, 19:51:08
Quote from: Andy B on 04 February 2014, 19:11:51
Quote from: f3nt0n on 04 February 2014, 18:36:34
.. The alternator is no longer spinning round.
.....

 ??? ??? Not sure what you mean ..... is the 'fan belt' still intact?

I might be wrong but I thought that inside the alternator, the 'wirey bits' spin round while charging the battery. They don't spin any more (if they did in the first place). Thanks.

Where are you looking  ...... the bottom right (as you stand in front of the car) is the a/c compressor and the middle bit doesn't spin unless it's engaged. The alternator pulley is always spinning irrespective of how much the alternator is charging.
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05omegav6

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Re: Foolish jump lead connection
« Reply #10 on: 04 February 2014, 21:05:29 »
Quote from: Andy B on 04 February 2014, 20:34:38
Quote from: f3nt0n on 04 February 2014, 19:51:08
Quote from: Andy B on 04 February 2014, 19:11:51
Quote from: f3nt0n on 04 February 2014, 18:36:34
.. The alternator is no longer spinning round.
.....

 ??? ??? Not sure what you mean ..... is the 'fan belt' still intact?

I might be wrong but I thought that inside the alternator, the 'wirey bits' spin round while charging the battery. They don't spin any more (if they did in the first place). Thanks.

Where are you looking  ...... the bottom right (as you stand in front of the car) is the a/c compressor and the middle bit doesn't spin unless it's engaged. The alternator pulley is always spinning irrespective of how much the alternator is charging.
All very interesting, but what of the Golfs' alternator  ::)
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Andy B

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Re: Foolish jump lead connection
« Reply #11 on: 04 February 2014, 21:33:39 »
Quote from: Taxi Al on 04 February 2014, 21:05:29
Quote from: Andy B on 04 February 2014, 20:34:38
Quote from: f3nt0n on 04 February 2014, 19:51:08
Quote from: Andy B on 04 February 2014, 19:11:51
Quote from: f3nt0n on 04 February 2014, 18:36:34
.. The alternator is no longer spinning round.
.....

 ??? ??? Not sure what you mean ..... is the 'fan belt' still intact?

I might be wrong but I thought that inside the alternator, the 'wirey bits' spin round while charging the battery. They don't spin any more (if they did in the first place). Thanks.

Where are you looking  ...... the bottom right (as you stand in front of the car) is the a/c compressor and the middle bit doesn't spin unless it's engaged. The alternator pulley is always spinning irrespective of how much the alternator is charging.
All very interesting, but what of the Golfs' alternator  ::)

Ooops!  ::) ::) ::)
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TheBoy

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Re: Foolish jump lead connection
« Reply #12 on: 05 February 2014, 19:52:10 »
And some VAG alternators have a clutch, so only engages when the electrics tell it to.
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TheBoy

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Re: Foolish jump lead connection
« Reply #13 on: 05 February 2014, 19:52:43 »
Though thought clutch was ecu controlled. Which could be expensive. Can VAG experts confirm?
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r1

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Re: Foolish jump lead connection
« Reply #14 on: 05 February 2014, 20:29:03 »
why do people still jump cars this way?
dosnt anyone read the handbooks with there cars?
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