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        General >> Problems >> REV Counter Stopped Working
        
(Message started by: hughiemc on Jan 29^th, 2008, 5:46pm)

Title: REV Counter Stopped Working
Post by hughiemc on Jan 29^th, 2008, 5:46pm

Hi all, after fitting a new (2nd hand) alternator i just took my 12v Ultima for a spin and noticed the rev counter was a bit 'twitchy' then it stopped working all together. Anyone got any ideas?

cheers

Hughiemc

Title: Re: REV Counter Stopped Working
Post by Mottsy on Jan 29^th, 2008, 6:26pm

When I first got mine the rev counter was twitchy.

It was repaired on warranty but I think it was the alternator bushes or diodes.

Hopefully someone more knowlegable will be along to help shortly.

Title: Re: REV Counter Stopped Working
Post by jonnycab on Jan 30^th, 2008, 2:34am

The rev counter works from the alternator :)

If it was fine before, then you'd have to assume that the second hand alternator is faulty :)

Title: Re: REV Counter Stopped Working
Post by ricky on Feb 28^th, 2008, 4:22pm

hi jonnycab, i see on a post you have said that the rev counter on the 12v is fed by the alternator is this correct as mine wont work either cheers ricky

Title: Re: REV Counter Stopped Working
Post by Snoopy on Feb 28^th, 2008, 5:42pm

Rev counter on the 12 v takes the pulse from the coil AFAIK.

Title: Re: REV Counter Stopped Working
Post by ricky on Feb 28^th, 2008, 5:47pm

thanks snoopy, thought so but was grasping for the old straw, will make a donation soon , ricky

Title: Re: REV Counter Stopped Working
Post by Snoopy on Feb 28^th, 2008, 5:51pm

Well as far as I know it does but look to the wiring diagrams for confirmation ..... ! WIRING (http://www.carsoft.ru/avtorepair/sierra/incl.pdf)

Title: Re: REV Counter Stopped Working
Post by jonnycab on Feb 29^th, 2008, 2:54am

What ?...the rev counter on the 12V works from the coil & not the alternator ???

Surely then, if the rev counter doesn't work, then the coil must be kaput....& if the coil is kaput, then the ignition can't work properly & the engine wouldn't be running very well :)

Please correct me if I'm wrong ;)

Title: Re: REV Counter Stopped Working
Post by Snoopy on Feb 29^th, 2008, 8:16am

NO JC it does not work as simply as that !

The coil can be OK but the pulses are the thing that matters and if the pulse counter fails then the rev counter fails...
ECU any way so its most likely the pulse counter has failed .

Newer cars do take the pulses from the alternator, BUT AFAIK the old 12 still uses the coil as the source of the pulse.

See HERE (http://www.monarchinstrument.com/enginetach.htm)

Title: Re: REV Counter Stopped Working
Post by Octavian_P on Feb 29^th, 2008, 11:59am

The 2.5 TD uses the alternator for the rev counter as it doesn't have spark plugs / coils ;)

Title: Re: REV Counter Stopped Working
Post by jonnycab on Feb 29^th, 2008, 12:29pm

Looks like I was wrong then :-[.....sorry :)

Title: Re: REV Counter Stopped Working
Post by hughiemc on Feb 29^th, 2008, 6:48pm

Hi all sorry for the TARDY reply, the single wire had popped off the alternator where the rev counter gets its feed from. I was going to sell her once repaired but I realised she is too nice to let go lol.

Title: Re: REV Counter Stopped Working
Post by jonnycab on Mar 1^st, 2008, 1:11am

on 02/29/08 at 12:29:37, jonnycab wrote:

Looks like I was wrong then :-[.....sorry :)

I'll take that back, thankyou very much ;D

Title: Re: REV Counter Stopped Working
Post by Snoopy on Mar 1^st, 2008, 7:59am

It would appear that I am wrong on this one .. Sorry if I misled anyone !

Title: Re: REV Counter Stopped Working
Post by ricky on Mar 1^st, 2008, 1:30pm

hi , thanks for the tremendous intrest and support from this site, all the answers and questions, i have sorted my rev counter out, on the 12v the rev counter is supplied from the alterater by the black and white, or white and black cable , it runs under the engine and up to a multiplug near the battery and this plugwas corroded, cleaned it and he presto working counter. it is only the stimulation from all the people on this site that makes it work, right or wrong it just makes you look for the answers witch in the cold light of day are always there , thanks ricky

Title: Re: REV Counter Stopped Working
Post by TiberiuS on Mar 1^st, 2008, 8:50pm

It's also worth soaking any connectors in switch cleaner and working them a few times, then packing them full of electrical grease like the stuff you can get from Maplin, it's an extra insurance against water getting in and leaving you stranded on the side of the M11 in the pouring rain :). I do this on all my cars and even my trusty 13 year old Mondeo which gets used in all weather still seems free of any electrical problems (touches wood).

Glad you sorted it ;)

Title: Re: REV Counter Stopped Working
Post by hughiemc on Mar 3^rd, 2008, 8:45pm

on 03/01/08 at 13:30:08, ricky wrote:

I totally agree, i just seen a thread about illuninated switch surrounds so guess what I will doing next few evenings!! This place has all the answers I am so glad I took by 2,9 Ultima 12v off e-bay!!