Go Back   Team-BHP > Under the Hood > Technical Stuff


Reply
 
Thread Tools Search this Thread
Old 3rd June 2008, 11:18   #1
Senior - BHPian
 
gd1418's Avatar
 
Join Date: May 2006
Location: Gurgaon
Posts: 3,578
Thanked: 655 Times
Default RPM blues

Friends,

A few days back I noticed by chance a peculiar happening with my Scorpio that is being shown by the RPM meter. When I switch on the side indicators, either the left or the right, then the RPM needle jerks/blinks backwards along with the blinking indicator lights as long as the indicator is on.

But this doesn't happen when the hazard blinkers are switched on. Now, why does this happen? Has anybody experienced this? Does it have to do something with the alternator charging circuit or the battery has gone weak?

Any input shall be helpful.
gd1418 is offline   Reply With Quote
Old 3rd June 2008, 11:55   #2
Senior - BHPian
 
suman's Avatar
 
Join Date: Sep 2005
Location: Gurgaon
Posts: 4,589
Thanked: 257 Times
Default

Sounds like a wiring or fuse issue. The hazard warning would be on a separate fuse as compared to the regular indicators I'd think?
suman is offline   Reply With Quote
Old 3rd June 2008, 12:07   #3
BHPian
 
Join Date: Mar 2008
Location: Chennai , Tamil Nadu
Posts: 282
Thanked: 56 Times
Default

Well now this is quite unusual and interesting . Guys shed some light on this please ??
kaush666 is offline   Reply With Quote
Old 3rd June 2008, 12:54   #4
Team-BHP Support
 
benbsb29's Avatar
 
Join Date: Nov 2006
Location: Brisbane
Posts: 8,025
Thanked: 3,483 Times
Default

On my bike, when the same started happening, i was told its owing to a weak battery. Replacing the battery took care of the problem.

GD Bhai, i feel its something to do with a weak battery.
benbsb29 is offline   Reply With Quote
Old 3rd June 2008, 14:30   #5
BANNED
 
Join Date: Aug 2005
Location: Kalyani, West Bengal
Posts: 444
Thanked: 6 Times
Default

Get the earth in the vehicle checked, also check the amps being made by your alternator with an amp meter.
Gurkha is offline   Reply With Quote
Old 3rd June 2008, 16:47   #6
Team-BHP Support
 
tsk1979's Avatar
 
Join Date: Feb 2005
Location: New Delhi
Posts: 22,955
Thanked: 15,648 Times
Default

Do you see any dip etc., when you switch on the headlights?
tsk1979 is offline   Reply With Quote
Old 3rd June 2008, 21:19   #7
Senior - BHPian
 
gd1418's Avatar
 
Join Date: May 2006
Location: Gurgaon
Posts: 3,578
Thanked: 655 Times
Default

No. The alternator is charging properly and the battery is fully charged

Quote:
Originally Posted by tsk1979 View Post
Do you see any dip etc., when you switch on the headlights?
gd1418 is offline   Reply With Quote
Old 3rd June 2008, 23:50   #8
Senior - BHPian
 
badboyscad's Avatar
 
Join Date: Feb 2007
Location: TN
Posts: 1,444
Thanked: 154 Times
Default

has to be something related to the wiring from the alternator. few days ago i too experienced a problem(somewhat different kind) with the rpm needle and the diagnostic resulted in an alternator problem.better check it out quick wit a.s.s, because my battery was fully discharged suddenly on a night trip due to this problem.
badboyscad is online now   Reply With Quote
Old 4th June 2008, 00:40   #9
Team-BHP Support
 
tsk1979's Avatar
 
Join Date: Feb 2005
Location: New Delhi
Posts: 22,955
Thanked: 15,648 Times
Default

Ok gd, try this. Switch on headlights, park close to wall, and then switch on indicator, do you see change in headlight intensity when indicator blinks?
tsk1979 is offline   Reply With Quote
Old 5th June 2008, 00:10   #10
Senior - BHPian
 
gd1418's Avatar
 
Join Date: May 2006
Location: Gurgaon
Posts: 3,578
Thanked: 655 Times
Default

Tried this, but had my own doubts as I've HIDs, that come with their own relays and ballasts. I didn't find any change in the intensity of HLs. However, I did this with my fog lamps as they were the normal bulbs. They too didn't show any change..

Quote:
Originally Posted by tsk1979 View Post
Ok gd, try this. Switch on headlights, park close to wall, and then switch on indicator, do you see change in headlight intensity when indicator blinks?
gd1418 is offline   Reply With Quote
Old 5th June 2008, 01:15   #11
BHPian
 
ankitahuja's Avatar
 
Join Date: Oct 2006
Location: Gurgaon & Delhi
Posts: 887
Thanked: 46 Times
Default

I can only assume of such possibilities could be due to moisture in the air that's causing some circuit disturbances, that it's been raining frequently in NCR?

Why dont you park in bright sun for few hours and then check the indicators.
ankitahuja is offline   Reply With Quote
Old 5th June 2008, 09:06   #12
Team-BHP Support
 
tsk1979's Avatar
 
Join Date: Feb 2005
Location: New Delhi
Posts: 22,955
Thanked: 15,648 Times
Default

gd, switch on the fog lights, and then switch on the indicator. Do you see fog lights dimming, or only the alternator needle jerking
tsk1979 is offline   Reply With Quote
Old 5th June 2008, 11:54   #13
GTO
Team-BHP Support
 
GTO's Avatar
 
Join Date: Feb 2004
Location: Bombay
Posts: 47,756
Thanked: 89,393 Times
Default

Damn the Mahindra electronics! GD, I am dead sure its a problem with your vehicles earthing. Get it checked.
GTO is offline   Reply With Quote
Old 5th June 2008, 12:18   #14
Senior - BHPian
 
Join Date: Mar 2006
Location: goa
Posts: 1,066
Thanked: 52 Times
Default

This is due to an earthing problem at the switch, as the hazard lamp work of different switch, the column mounted switch may have a wire touching the earth and drawing more current than required and so this may cause the problem.
dinar is offline   Reply With Quote
Old 5th June 2008, 13:27   #15
Senior - BHPian
 
gd1418's Avatar
 
Join Date: May 2006
Location: Gurgaon
Posts: 3,578
Thanked: 655 Times
Default

Read my post #: 10..

Quote:
Originally Posted by tsk1979 View Post
gd, switch on the fog lights, and then switch on the indicator. Do you see fog lights dimming, or only the alternator needle jerking
gd1418 is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Is Fuel efficiency strictly a function of RPM or is it speed+gear+RPM? Astleviz Technical Stuff 54 25th November 2011 09:22
Radiator Fan Blues tsk1979 Technical Stuff 14 29th October 2007 17:31
rpm below idle rpm tortoise Technical Stuff 12 2nd April 2007 00:51
Rain Blues! v.tec Shifting gears 16 11th March 2006 12:28
Suspension blues typeOnegative Technical Stuff 9 29th June 2005 12:51


All times are GMT +5.5. The time now is 11:58.

Copyright 2000 - 2017, Team-BHP.com
Proudly powered by E2E Networks