Author |
Topic: erratic rev counter & alternator Whine (Read 511 times) |
|
mattir
Newbie
I'm a YaBB newbie!
Posts: 2
|
 |
erratic rev counter & alternator Whine
« on: Nov 18th, 2007, 5:24pm » |
 Quote  Modify
|
Hi,
I've recently bought myself a 1996 24v Ultima, which on the whole is really good. It has a few niggles which I'm slowly ironing out, however I'd really appreciate anyones thoughts on the following two.
The Rev Counter does not make much sense at all. It fluctuates wildly, bounces around and does not seem to ever give a sensible reading. Has anyone else had this problem? if so does anybody know the cause? is their a possible repair? I had a chat with my local ford dealer and I now understand that the rev counter, tacho is a combined module that is quite sophisticated and does quite a few clever things. Apparenty the part is now obsolete, however if Ford still carried it, it would cost me in excess of £300.
2nd problem, the audio system (standard ford head unit with cd changer in the boot) is suffering from alternator whine. This occurs wheather you're playing a cd, a cassette, or the radio. I can't believe it is meant to be like this, given what the car would have cost new. Also, my dads 1991 granada audio is as clear as a bell so I would hope that things didn't go backward in the intervening years. If anybody has any ideas on this one I'd also appreciate it.
Thanks.
Matti 
|
|
 IP Logged |
|
|
|
martin_rowe
Full Member
I love YaBB 1G - SP1!
Posts: 879
|
|
Re: erratic rev counter & alternator Whine
« Reply #1 on: Nov 19th, 2007, 8:42am » |
Quote Modify
|
check alternator output, cleck all earths / wireing condition, could be related, tacho picking up 'noise' from alternator.
|
|
IP Logged |
Rally Drivers Do It Sideways
|
|
|
Jonnycab
Senior Member
Former owner of 2.3 Ultima Facelift saloon
Posts: 3900
|
|
Re: erratic rev counter & alternator Whine
« Reply #2 on: Nov 19th, 2007, 9:47am » |
Quote Modify
|
 ....It's does sound as though you may have a problem with the alternator as both your problems sound alternator related.
The rev counter works off the alternator output & radio interference, as far as I know, is caused by a dodgy alternator diode
|
|
IP Logged |
|
|
|
martin_rowe
Full Member
I love YaBB 1G - SP1!
Posts: 879
|
|
Re: erratic rev counter & alternator Whine
« Reply #3 on: Nov 19th, 2007, 3:30pm » |
Quote Modify
|
hence check alternator / wireing, best check for alternator would be with osciloscope to check wave pattern, multimetre would be ok, would have lower output, some alternator testers can show diode fault also.
|
|
IP Logged |
Rally Drivers Do It Sideways
|
|
|
mattir
Newbie
I'm a YaBB newbie!
Posts: 2
|
|
Re: erratic rev counter & alternator Whine
« Reply #4 on: Nov 21st, 2007, 1:02pm » |
Quote Modify
|
Hi Guys,
Thanks for all your thoughts, these are much appreciated and may well have saved me from pursuing a couple of dead ends! From what you've all said, faulty alternator diodes would make a lot of sense. In fact the bahviour is very reminiscent of that I've experenced with other Fords when jump started with flat batteries. The Tacho's on all my old Xr2's used to jump around like this until the battery got a bit of charge in it and damped everything down. I'll definately have a look and see if I can isolate this as the cause.
Thanks again.
Matt
|
|
IP Logged |
|
|
|
|
Home
Help
Search
Members
Login
Reply
Send Topic
Print