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General => The garage => Topic started by: stainesy on 28 May 2011, 16:37

Title: help with strange problem
Post by: stainesy on 28 May 2011, 16:37

I just changed the alternator on my brothers seat cupra 1.8 20v. Everything works great but now when I turn the ignition off and take key out the car carrys on running.
When ignition off and car still running I put it in revurse with clutch still down and engine turns off.
But if ignition on and car running goes into revurse as normal.

Any ideas what's going on?

Title: Re: help with strange problem
Post by: justalex81 on 28 May 2011, 16:51

did you disconnect battery when you changed it?

Title: Re: help with strange problem
Post by: stainesy on 28 May 2011, 17:32

Ooooops no I didn't lol.
Why's that?

Title: Re: help with strange problem
Post by: stainesy on 28 May 2011, 17:40

You recon it might just need to disconect battery over night and put back on in morning to reset the ecu?

Title: Re: help with strange problem
Post by: Thom89 on 28 May 2011, 17:53

I'd say you have a wire on wrong! sounds like the alternator is still feeding the ignition system, whether its switched on, or off!

Thom

Title: Re: help with strange problem
Post by: salsheikh on 28 May 2011, 18:23

to reset the ecu you only need to leave the battery disconnected for 15-20 mins. check all the wires again to make sure the right connections have been made.

Title: Re: help with strange problem
Post by: stainesy on 28 May 2011, 18:37

There's only 2 connections. The oval clip that only goes one way and the thick earth cable that's it.

Title: Re: help with strange problem
Post by: dazzawest1987 on 28 May 2011, 19:30

Are the dash lights staying on or is it just the engine continues running

Title: Re: help with strange problem
Post by: Dan_GTi8v on 28 May 2011, 19:49

The big cable should be going to positive not earth surely? At least it does on my 20vt. Not that that would cause the problems you describe

Title: Re: help with strange problem
Post by: stainesy on 28 May 2011, 20:57

no the dash lights go off and even ignition goes off and nothing works like windows wipers and normal stuff that comes to life when ignition off its just that the engine thingyinues running.

maybe it is the positive cable just said it was earth coz its black anyway every cable is in the same place as they came off old one. cables are fine.