Alternator light stays on

[Laskopivo]

Hi,
Im having trouble with my alternator light since Feb 2010. Got a reco alternator last week, but lighcame back 10mins after driving out of Mechanics. Got them to change it again, now battery light is on more than ever. Tested voltage with car running and it holds 13-14volts. Any ideas?
Thanks

 

[11gothevt11]

Yeh i need help on this to
I just changed regulator battery light off for 15 minutes charging 14.2 volts at 2500rpm
Then battery light on charging 11.7 2500rpm

 

[moose man]

Hi,
Im having trouble with my alternator light since Feb 2010. Got a reco alternator last week, but lighcame back 10mins after driving out of Mechanics. Got them to change it again, now battery light is on more than ever. Tested voltage with car running and it holds 13-14volts. Any ideas?
Thanks

Alternator charging voltge is not everything. Charging current is the often forgotten about measurement. You need to connect a 50A ammeter between the alternator charging terminal and the wire that connects to it, so that the current flows through the ammeter. Turn the car on, run it at 2500RPM and load the electrical system to about 10 or 20 amps using high beams, air conditioning, rear demister, blower fan etc. Check that the alternator can keep up.
Ideally you should use a hand-held load device so you can dial up exact amp loadings and check the alternator matches it.

 

[moose man]

Yeh i need help on this to
I just changed regulator battery light off for 15 minutes charging 14.2 volts at 2500rpm
Then battery light on charging 11.7 2500rpm

Too low. Should be 13.8 to 14.2, maybe up to 14.7V.
Check your connections, from the alternator to battery, and body and engine earths. sand them back and tighten them up firmly.

 

[11gothevt11]

Too low. Should be 13.8 to 14.2, maybe up to 14.7V.
Check your connections, from the alternator to battery, and body and engine earths. sand them back and tighten them up firmly.

Hi there
Befor i changed regulator i cleaned ,sandpaper all battery leads connact points
Pulled off all earth leads i could find in engine bay cleaned...sandpaper
I checked 3 leads that go onto regulaotr all have power


With new regulator fitted in

11.7 v at battery engine off
11.1 volt on brushes without being fitted to alternator

Now regulator fitted
11.5 v with engine at idle

So fitted old regulaotr
11.42 ar battery...
But get this only 1.55 volts on one brush and 3.2 volts on other brush
now regulator fitted
11.4 v at idle
11.56 at 2000 rpm
Then turned engine off 11.83

So the question is why isn't these charging????

What can i check befor buying a new alternator???
Wire current check???? how do i do this????

PLease help any comments welcome

 

[maginoodle]

i would be checking that the +ve lead that goes from the alt to the batt is good.
can test by checking the voltage at the batt and the alt while its going. the reading should be pretty much identical.
if you have been getting these readings all at the batt its most likely the lead.

 

[11gothevt11]

Yeh i tested the lead at back of alternator
Same as battery voltage maybe 0.01 differance

No burning on the lead the lead is tight
CAn you think of anything eles???
Thanks for your help