RPM blues

gd1418 · 3rd June 2008, 11:18

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.

suman · 3rd June 2008, 11:55

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?

kaush666 · 3rd June 2008, 12:07

Well now this is quite unusual and interesting . Guys shed some light on this please ??

benbsb29 · 3rd June 2008, 12:54

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.

Gurkha · 3rd June 2008, 14:30

Get the earth in the vehicle checked, also check the amps being made by your alternator with an amp meter.

tsk1979 · 3rd June 2008, 16:47

Do you see any dip etc., when you switch on the headlights?

gd1418 · 3rd June 2008, 21:19

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

Quote:

Originally Posted by tsk1979

Do you see any dip etc., when you switch on the headlights?

badboyscad · 3rd June 2008, 23:50

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.

tsk1979 · 4th June 2008, 00:40

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 · 5th June 2008, 00:10

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

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?

ankitahuja · 5th June 2008, 01:15

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.

tsk1979 · 5th June 2008, 09:06

gd, switch on the fog lights, and then switch on the indicator. Do you see fog lights dimming, or only the alternator needle jerking

GTO · 5th June 2008, 11:54

Damn the Mahindra electronics! GD, I am dead sure its a problem with your vehicles earthing. Get it checked.

dinar · 5th June 2008, 12:18

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.

gd1418 · 5th June 2008, 13:27

Read my post #: 10..

Quote:

Originally Posted by tsk1979

gd, switch on the fog lights, and then switch on the indicator. Do you see fog lights dimming, or only the alternator needle jerking

3rd June 2008, 11:18	#1
gd1418 Senior - BHPian Join Date: May 2006 Location: Gurgaon Posts: 3,578 Thanked: 728 Times View My Garage	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.
	() Thanks

3rd June 2008, 11:55	#2
suman Senior - BHPian Join Date: Sep 2005 Location: Kolkata Posts: 4,589 Thanked: 279 Times View My Garage	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?
	() Thanks

3rd June 2008, 12:07	#3
kaush666 BHPian Join Date: Mar 2008 Location: Chennai Posts: 311 Thanked: 79 Times	Well now this is quite unusual and interesting . Guys shed some light on this please ??
	() Thanks

3rd June 2008, 12:54	#4
benbsb29 Team-BHP Support Join Date: Nov 2006 Location: Brisbane Posts: 9,969 Thanked: 13,231 Times View My Garage	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.
	() Thanks

3rd June 2008, 14:30	#5
Gurkha BANNED Join Date: Aug 2005 Location: Kalyani, West Bengal Posts: 444 Thanked: 10 Times	Get the earth in the vehicle checked, also check the amps being made by your alternator with an amp meter.
	() Thanks

3rd June 2008, 16:47	#6
tsk1979 Team-BHP Support Join Date: Feb 2005 Location: San Jose, CA Posts: 23,717 Thanked: 22,825 Times View My Garage	Do you see any dip etc., when you switch on the headlights?
	() Thanks

3rd June 2008, 23:50	#8
badboyscad Senior - BHPian Join Date: Feb 2007 Location: TN Posts: 1,511 Thanked: 477 Times View My Garage	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.
	() Thanks

4th June 2008, 00:40	#9
tsk1979 Team-BHP Support Join Date: Feb 2005 Location: San Jose, CA Posts: 23,717 Thanked: 22,825 Times View My Garage	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?
	() Thanks

5th June 2008, 01:15	#11
ankitahuja BHPian Join Date: Oct 2006 Location: Gurgaon Posts: 921 Thanked: 94 Times View My Garage	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.
	() Thanks

5th June 2008, 09:06	#12
tsk1979 Team-BHP Support Join Date: Feb 2005 Location: San Jose, CA Posts: 23,717 Thanked: 22,825 Times View My Garage	gd, switch on the fog lights, and then switch on the indicator. Do you see fog lights dimming, or only the alternator needle jerking
	() Thanks

5th June 2008, 11:54	#13
GTO Team-BHP Support Join Date: Feb 2004 Location: Bombay Posts: 70,546 Thanked: 300,788 Times View My Garage	Damn the Mahindra electronics! GD, I am dead sure its a problem with your vehicles earthing. Get it checked.
	() Thanks

5th June 2008, 12:18	#14
dinar Senior - BHPian Join Date: Mar 2006 Location: goa Posts: 1,066 Thanked: 57 Times	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.
	() Thanks