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Battery light is coming on?

Tiny
FASTFOOT
  • MEMBER
  • 3 POSTS
Jack,

I did not do this job myself, I was done by a friend of a friend so suppose to know hondas really well. I am beginning to doubt this as the car was working fine before the water pump went out.

What steps can I take now to insure if this was done correctly - what options do I have? Also can you give me more details as to the why it would have these effects on the car. Really appreciate your help and would like my car running again.
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Tuesday, August 25th, 2020 AT 12:50 PM (Merged)
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Be sure the belt is tight first. Then start the carand watch thecrank pulley to be sure itis spinning. If ok you will need to get a meter to test continuity from the big charge wire on the alt to the battery. As far as checking thecam timing (since it dies) you will need to line up the mark on the crank pulley then remove the valve cover to be sure the marks on the top gear (cam) are lined up
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Tuesday, August 25th, 2020 AT 12:50 PM (Merged)
Tiny
FASTFOOT
  • MEMBER
  • 3 POSTS
Ok, I see how it goes this weekend, will post back later.

Thanks.
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Tuesday, August 25th, 2020 AT 12:50 PM (Merged)
Tiny
THE T SHIRT GUY
  • MEMBER
  • 3 POSTS
  • 1989 HONDA ACCORD
  • 4 CYL
  • FWD
  • MANUAL
  • 225,000 MILES
I have a new alternator installed, now the battery light stays on. The voltage is 14.4 with the engine on and 12.3 with the engine off.

I installed it myself, I have some mechanical skill, everything was reconnected correctly.

The new alternator was a reconditioned unit that matched the original. How can I fix this?

Thanks in advance,

Tom
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Tuesday, August 25th, 2020 AT 12:50 PM (Merged)
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Youre absolutly sure ALL wires on the back of the alternator are reconnected?
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-1
Tuesday, August 25th, 2020 AT 12:50 PM (Merged)
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Let me know what you find
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Tuesday, August 25th, 2020 AT 12:50 PM (Merged)
Tiny
THE T SHIRT GUY
  • MEMBER
  • 3 POSTS
I will test the plug-in connector for voltage, so if there's a constant line in as well as an ignition line, could one be at fault and the unit still operate?

Is that why the battery light stays on?

Electrical is somewhat puzzling to me. But I'm learning.
I'll get a diagram of the plug-in to refer to.

Thanks again for the input.
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Tuesday, August 25th, 2020 AT 12:50 PM (Merged)
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Be aware Honda manual states "If any fuses are blown, charge light will stay on, even if charging system is working properly! ", So check ALL fuses, even the ones under the hood!
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Tuesday, August 25th, 2020 AT 12:50 PM (Merged)
Tiny
LES H.
  • MEMBER
  • 2 POSTS
  • 1989 HONDA ACCORD
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 60,000 MILES
I have a 1989 Honda Accord that I just replaced the Alternator on. When the alternator failed the BAttery Light also came on. The voltage across the battery was reading 11.3 Volts with the engine running or not. After replacing the Alternator the voltage is 12.3 across the battery (Not Running) and 14.5 with the car running. Help.
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Tuesday, August 25th, 2020 AT 12:50 PM (Merged)
Tiny
THE T SHIRT GUY
  • MEMBER
  • 3 POSTS
I metered the plug-in connector for voltage, the terminal (S) was zero, checked the fuse- bingo. The #8, ACG(S) 10 amp fuse was blown. I replaced the fuse and checked the voltage at the terminal (S) and now there is voltage.

I puts humpty dumpty back together again, starts up, voltage is at 14.4.

The battery light is out.

Thanks
Tom, the T Shirt Guy
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Tuesday, August 25th, 2020 AT 12:50 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
After replacing the Alternator the voltage is 12.3 across the battery (Not Running) and 14.5 with the car running. Help.

12.3 is low for an open voltage reading-14.5 volts running the alternator is putting-could be the battery is not taking the charge.

Load test the battery-
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Tuesday, August 25th, 2020 AT 12:50 PM (Merged)
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Good deal.
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Tuesday, August 25th, 2020 AT 12:50 PM (Merged)
Tiny
GREASYSNOT
  • MEMBER
  • 1 POST
  • 1985 HONDA ACCORD
Electrical problem
1985 Honda Accord 4 cyl Front Wheel Drive Automatic

battery lamp stays on, new alternator and is charging at 14.5 volts at idle.
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Tuesday, August 25th, 2020 AT 12:50 PM (Merged)
Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
Check alternator wire harness connections
check drive belt tension.
Battery must be fully charged prior to beginning test.
Alternator Output Test
With engine off, disconnect White wire from alternator battery terminal.
Connect ammeter positive lead to alternator battery terminal, and negative lead to wire just removed. Connect voltmeter to battery.
Start engine. Turn on headlights (high beam), rear window defroster, and turn heater fan switch to highest setting. Run engine at 3000 RPM. Ammeter should show about 60 amps for Accord and Prelude, 50 amps on Civic. Check alternator if not to specification.


https://www.2carpros.com/forum/automotive_pictures/99387_Graphic1_538.jpg

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Tuesday, August 25th, 2020 AT 12:50 PM (Merged)

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