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Battery terminal light and brake light comes on on dashboard

New alternator and battery charging correctly, why is this happening

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What kind of car do you have?

Posted on Apr 15, 2014


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Car is operating off battery only

Check the main lead from the alternator back to the battery especially at the battery terminal where it may be corroded off. While the alternator may be good if there is a failed diode in the rectifier in the back of the alternator it will not charge as it will be producing ac current and you need dc to charge the battery.

Jun 04, 2013 | 1987 Volvo 240

2 Answers

The battery light and the brake light come on. This just started yesterday. We replaced the battery and front brakes two weeks ago. Is this just a glitch in the computer?

When you replaced the battery, did you have the alternator tested? The battery light indicates either the battery is not holding a charge or not receiving the proper power from the alternator to charge the battery.
The brake lights could be a glitch but it could also mean that you are low on brake fluid or you have air in the brake system. Suggest you at least check the fluid level in the master cylinder and bleed the brakes.

Sep 06, 2011 | 2002 Isuzu Axiom

1 Answer

Brake and Batt warning lights on at same time while engine running. Brake fluid is max and alternator belt looks good.

1st clean all the battery connections,, it appears whats happening is that the alternator isn't being able to charge the battery after a start , normally a good cleaning will do the trick, But your battery could have a bad cell too, Just because a meter says 12volts, doesn't mean the battery has the amps it needs, so have the battery charged, then LOAD tested, any parts store usually can do this for you . once charged, and with a meter connected to the battery terminals, you should get a reading of 13.5-14.5 volts, if not, you have an alternator issue,, unless the brake pads are worn excessively, correcting the battery issue most the time will also clear the brake light

Jul 31, 2011 | Nissan Altima Cars & Trucks

2 Answers

I have a 2002 Mercedes Benz C240. My car won't start every now and then and have to charge up the battery. Thought the battery might be bad so bought a brand new battery and still happens and gets a...

Hi there.
You must have a drain some where.
Make sure the brake light are NOT staying on. if they are, it will drain the battery. this is due to faulty brake light switch.
I think the ESP light is related to the brake light switch.

May 22, 2011 | 2002 Mercedes-Benz C-Class

1 Answer

Battery and brake light constantly comes on

Battery light comes ON,this is indication of battery not getting charged by the alternator in the car.So the battery is loosing its charge/voltage.Other possibility of battery light coming on is battery is getting weak and it needs to be replaced.In some cases,just removing and cleaning the battery terminals and then reconnecting the battery terminals again.solves the problem.But also check the battery voltage by voltmeter.A fully charge proper battery will give 12 volts.If there is then get the battery terminals cleaned and reconnect and check.-------------- Now another problem,the brake light comes on when,the brake fluid is near to end or there is any problem with brake system,that is if brake pads are getting worn out or brake caliper is getting loose,In this case first check the brake fluid,if that is fine then check the brake pads and caliper.If that is also checked fine,then only in that case.Check the brake light switch.The switch is located where the brake lever is.Remove that brake switch,clean its wiring and recheck.It should help.-------------- Thanks.Helpmech.

Jan 18, 2011 | 1997 Nissan Maxima

1 Answer

Brake light on, gas light on, battery light on. Dashboard lights.

Hi, that would be your alternator needs to be overhauled. The battery light is usually a good indicator that your alternator is not charging.
You'll need to get the bearings,brushes, and vacum pump seals replaced. Hopefully the regulator is ok, but they will test this when you get it repaired.

In short your alternator is not charging....

Feb 11, 2010 | 1992 Isuzu Trooper

2 Answers

The dashboard brakelight came on after having the alternator/and belt replaced,and the battier dashlight is on now too. why?

It is not a rare occurence that a starter or alternator is replaced in a vehicle, and the new or rebuilt unit used is defective. The easiest way to check your charging voltage at your battery (to determine if your alternator, although just recently replaced, is still bad), is to use a very basic voltmeter or DMM (digital multimeter). Switch to DC Volts on the meter, touch the black (common) terminal on the DMM to the black or negative battery terminal, and touch the red to the red or positive battery terminal. With your vehicle running (be careful with this!), your voltage at the battery should be in the neighborhood of 13.4 Volts - 14.6 Volts. If it is higher (like 17 volts) or lower (like 12 volts), you may still have an alternator issue! This is all assuming that the alternator and belt was installed correctly. As far as the battery light goes, the first thing I would recommend checking is the brake fluid reservoir (check your owner's manual if you are unsure how to locate it- they have pictures), if the fluid is a bit on the low side, try filling it just a bit to see if the light goes out. A low fluid level may indicate a leak in the hydraulic brake system, or it may indicate that you need your brakes serviced. Sometimes there is no major issue, and the level is simply just a bit too low! All you need to do is fill the reservoir just a bit to get the light to go out. Be careful not to dismiss this problem as a quick fix, you want to make sure that the vehicle does not need brakes or does not have a leak in the system as this is a safety hazard! Try these few things and feel free to get back to me and let me know how it works out for you.

Nov 07, 2009 | 1995 Nissan Maxima

1 Answer

My 06 sedona battery light and emergency brake light come on together and off together intermittantly. Changed battery already, no major change. Whats happening?

Check your charging system and wiring at alternator..are your battery terminals clean??? is your drive belt loose or need replacing???

Oct 11, 2009 | 2006 Kia Sedona

1 Answer

Brake and battery dashboard lights remain on with

If the brake and battery light are illuminated then you should have your alternator tested. It is possible that your charging system is failing in some way. Make sure your belt is on the engine. If the belt is on then make sure it is in good condition and tight. Make sure battery terminals are tight. Have the charging system tested.

Sep 07, 2009 | 2003 Nissan Altima

1 Answer

Battery light will not go off

I am posting a generic reply to the "charge fail" lamp (that is the correct term - when the lamp is lit = the battery is NOT being charged) problems rather than a specific cure for the ills in your car.

I suspect a faulty alternator OR an inadvertent short to battery - potential of the wire leading from the charge fail lamp to the battery charging alternator. Please try the following tests (BE CAREFUL while working - you are working near the engine + v belts + fans etc. and a fully charged battery = can be very dangerous)

Locate the three terminals of the battery charging alternator. The largest terminal would be connected to the battery positive cable (may be red in colour). The second terminal could be labeled as "W" = this is the terminal generating a frequency proportional to the engine speed for the tachometer. The third terminal is the WL or D terminal. The Charge Fail lamp is connected from battery positive (via the ignition switch) to this WL/D terminal.

Turn the ignition switch on but don't start the engine. Observe the "Charge Fail" lamp glowing in the dashboard. Now remove the wire going to the WL/D terminal. The "Charge Fail" lamp should now stop glowing. If the lamp continues to glow, there is surely a shortcircuit between the wire from the lamp to the alternator.

As this lamp current is not going to the WL/D terminal due to the short circuit, the battery charging alternator is not producing very little or no output. Check if the battery terminal voltage rises when the engine is running. If the alternator is working correctly, the battery would be at 13.2 Volts with the engine running.

The confirmatory test is to rig a spare lamp (12V, 3 or 5 watt lamp in a holder) between battery + to the WL/D terminal - if that works properly (lit when the engine is stopped and off when the engine ir running), you can connect a new wire from the lamp to the WL/D terminal - do isolate the earlier wire completely from from lamp as well as alternator end.
Hope this helps. Write back if I have confused you further.....

Apurva from Pune, India.

Mar 12, 2009 | 2004 Ford Mustang

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