Question about JUMP START SYSTEM

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The sealed Battery has a voltage reading of 1.49 volts across the battery terminals. Does this indicate a failed or discharged battery. I tried charging the battery with the battery installed in the unit for 24 hours and no chang.

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Yup the battery needs to be changed.

Posted on Jan 23, 2014

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Posted on Jan 02, 2017

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SOURCE: output voltage unable to get above 90 V AC on

With the car voltage at 13.8V and you have less then a 400 Watt load the inverter is probably bad. The output voltage is not adjustable by the user.
Good Luck,
Gil

Posted on Mar 01, 2010

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KUN 26 D4D Hilux...something is draining the battery over 3 or 4 days...Alternater putting in 13.85v but battery goes flat over 4-5 days


13.85 volts is barely sufficient and would indicate an alternator fault if the reading was taken "off-load"..

An alternator is not designed to charge the battery and is incapable of doing so because the terminal voltage of the battery quickly rises to fool the voltage regulator into believing even a discharged battery is fully charged and will quickly reduce the charge rate to a trickle.

The alternator is therefore designed to keep a fully charged battery fully charged by supplying all the current for the vehicle equipment and the output rating is chosen for this purpose.

The voltage regulator should limit the off-load voltage to about 14.5 volts but that is only a small part of the alternator test. A professional would apply a load across the battery equal to the rated output while monitoring the voltage and current. Most healthy alternators exceed specifications.

For a sensible in-service test when an adjustable load isn't available, with a fully-charged battery it is sufficient to start the engine, leaving it to idle and switch on all the vehicle equipment. Fit a voltmeter to the battery and wait while the battery voltage is pulled down by the load - to around 12.5 volts. Raising the engine speed to 2500/3000 rpm should cause the voltmeter to suddenly rise.
13.85 would be just about acceptable "on-load" but in excess of 14.0 volts would be ideal.

Jul 10, 2016 | Cars & Trucks

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Engine electricals




3) Spark: From battery to spark plug

The battery is the source of stored electrical power in the vehicle. A voltmeter between the terminals of a healthy battery should read 12.5 volts. A reading of 12.2 volts indicates a flat battery and a reading of 10.4 volts indicates a dead cell (each cell beingabout 2 volts). A battery should be capable of sustaining high current, as needed by the starter motor when turning the engine over. When the car is running the voltage measured across the terminals shouldbe between 14.2 and 14.5 volts. The value is the voltage being supplied to the battery by the output charge from the alternator. THis charging voltage should not alter much when additional load is applied to the battery (head lights on etc).
When the ignition key is turned to the second position,often referred to as 'key on engine off', all car functions are powered up including lights and fuel pump. When the key is turned to position 3 many ancillary functions are temporarily interrupted to allow the battery to meet the extra needs of the starter motor. Electrical charge from the starter switch passes through a master fuse and starter relay before energizing the starter solenoid. The starter solenoid moves the pinion gear on the starter motor to engage with peripheral teeth of the flywheel. Simultaneously, heavy copper contacts are bridged by this same movement causing the starter motor coils to become energized thereby turning the engine over.
During the ignition process electrical charge passes through the primary windings of the ignition coil(s). The engine control unit (ECU), taking signalsfrom the engine crank position sensor, collapses the field of the coil(s) appropriate to the cylinder requiring ignition. As the field collapses the secondary coil windings discharge very high voltage through the high tension lead to the spark plug. The charge is so high that at the spark plug gap the charge jumps across with a spark. The compressed fuel air mixture in the cylinder is ignited by this spark.
Checking the spark process starts with the plugs. The condition of the removed plugs reveals a lot about the nature of the ignition within the cylinders. Dark sooty deposits indicate overly rich fuel air mix and glazed plugs indicate overly hot lean mixtures. Removing the plugs (with the fuel pump relay unplugged) and holding the screw threads to the cylinder head whilst turning the engine over will reveal the quality of spark. The spark holders and leads should be examined for discharge through the insulation to the cylinder head. Removing the leads from the coil should reveal sparks emanating from the exposed connectors. Failure to see sparks at this point indicatesa failed coil (especially if neighboring coils show good spark) or a failed crank sensor if all coils show no spark.
NEXT 1.1 MAF Mass Air Flow sensor

on Jul 15, 2011 | Mercedes-Benz E-Class Cars & Trucks

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How to Revitalize/Restore a Laptop Battery


After many hours of usage a laptop battery loses its' discharge time - it doesn't last as long as when it was new. The reason for this is because the internal memory of the battery has shortened the original capacity. Thus it remembers a shorter capacity than the longer one. This is due to charging the battery when it has not fully discharged. Here is a tip to reset the memory.You will need the following items:
  1. 19 and 10 Volt DC lamps with leads.
  2. A multimeter to measure resistance and Voltage.
  3. Two thin gauge wires about 3 inches long (should be able to fit into battery terminals).
  4. Electrical tape.

Locate the positive and negative terminals with a Volt meter using the two thin gauge wires - there may be more than two terminals. You just need to find the positive and negative. The voltage should be around or lower than 19 Volts. If the Voltage is higher than 10 Volts, insert the 19 Volt lamp to the terminals. The lamp should light.
Secure the lamp's leads with electrical tape to the battery and wait until the lamp extinguishes or go dim. This may take several hours depending on the level of charge the battery has.Then insert the 10 Volt lamp and wait again until it extinguishes. If the battery read 10 Volts or lower when first measured, then start with the 10 Volt lamp instead of the 19 Volt.We want to fully drain the battery with the lamps.If no voltage measures from the terminals, chances are the battery is bad and cannot be revitalized. Measure resistence between different combinations of each terminal with the Ohm section of the multimeter. If you read a short or low resistence, then the battery is bad - do not attempt to charge it. It could damage the laptop's power adapter.When you are confident that the battery has fully discharged, it's now time to charge the battery. Connect to the laptop and wait until the battery fully charges while the power adapter is connected. Do not power the laptop while the battery is charging - wait until it fully charges by observing the charging indicator on the laptop.When the battery has fully charged, test it by using the laptop and make note of how long it operates until it warns of a low battery level. If the duration has improved, congratulations! You are done. If it doesn't, then perform the above process again.



on Jan 17, 2011 | Computers & Internet

1 Answer

THE ALTERNATOR IS NOT CHARGING THE BATTERY WHAT IS THE SOLUTION


Loose drive belt---loose wires or connections on alternator--- Dirty battery terminals--clean to shiny metal both battery and leads.---- faulty rectifier in alternator.. Pace a multimeter across the battery terminals and set to dc volts reading Place revs at around 1500 rpm and read voltage . if no reading set to ac voltage and repeat. If you get an ac volts reading replace the alternator.

Mar 16, 2013 | Cars & Trucks

1 Answer

Have not had any problems with vehicle. Went out to start it tonight and it would not start. Sounds like engine is trying to turn over, but it won't. Light comes on indicating "service emission


Does the engine turn over fast or is it sluggish? Headlights bright or dim? If engine turns over sluggish and headlights are dim, I'd suspect a defective/discharged battery or possibly a charging problem causing the battery problem. Start by making sure the battery cable terminals at the battery posts are clean and tight.

Put a voltmeter across the battery posts with the engine off, you should measure 12.8 volts if the battery is fully charged. Less voltage and the battery is not fully charged. When you try to start the engine, the battery voltage will drop momentarily when the starter is engaged. I would not be surprised to see the voltage to drop to 8-9 volts when the starter is engaged and the engine turning over. If it drops to a lower voltage, I would suspect a battery problem. The "service emmisions" light I would expect to be a secondary indication and resolve itself once the engine starting problem is resolved.

Nov 04, 2012 | 2007 Ford Escape

1 Answer

We have the newcon optik. Wer took the batteries out to store it. We want to use itnow,put batteries in and it dont work. The number on it is (n99703638)


Hello there, alway check the battery. It can be check with a DMM for voltage but the battery needs to have a load on it. Hook up a couple flashlight bulbs across the + and - terminals. Then check the voltage across the battery with the load (bulbs). If the voltage across the battery is about 2.6v on a 3 volt battery with the load it's OK. Example: The same with your car battery that has a 12 volt system.---put a DMM across the terminals and it show approx 12 volts. Try starting the vehicle and if the voltage dropes below 10 volt while trying to start the auto, then the battery is or needs to charge. or it's bad Example, to check you vehicle to see on DMM if it is really charging. Start the vehicle and let it run, then check the voltage across the 12 volt battery. It should be 13.8 volts. This will indicate that the charging system of the vehicle is work. stewbison

Mar 22, 2011 | NewCon Optik Optics

2 Answers

Have placed brand new battery but for only a week the battery is dead already, Is this a alternator problem?


This could be the alternator. Bring your vehicle to a shop and have them test both the battery and the alternator. I have seen brand new batteries come off the shelf and fail so it could be either

Jan 16, 2011 | Ford Escape Cars & Trucks

1 Answer

Battery died, replaced altenator, got new battery, battery still dieing


Since you replaced both the alternator and the battery, it should be working and the first thing to check is for loose and corroded connections.
In any case, this is what you should do to check the health of your car charging system with the assistance of a good (no need for an expensive unit) digital multimiter:
1) With the car engine not running and ignition off, measure the voltage across the battery: it should read around 12.8 Volts and anything below 10.5 Volts would indicate a faulty battery with possibly one or more shorted cell.
2) With engine running and idling, measure the voltage around the battery terminal: it should read around 13.8 Volts and any thing below 13.5 Volts or much above 13.8 will indicate a faulty alternator OR alterntor regulator.
3) Repeat step two by gently reving the engine: the correct 13.8 Volts should be maintained even with car light on.

Hope it helps: let me know how you go!

Apr 24, 2010 | 1999 Toyota Avalon

2 Answers

John Deere LX188 lawn tractor battery discharge light remaining o


Check the brown wire feeding your voltage regulator,its between batt and steering wheel behind left side of frame.LX100 series machines had a problem with brown wire not fully contacting terminal in regulator.You will know you had bad contact if plastic is discolored.

Sep 23, 2009 | Garden

2 Answers

Battery Light keeps coming on in my 1997 Windstar


Most likely there is a bad diode in the alternator. needs tested.

Jun 24, 2009 | 1997 Ford Windstar

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