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When connect to battery no current shown in meter and engine not start hirn not blow but when disconnect battery engine start

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Posted on Jan 02, 2017

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SOURCE: Dead Batterry. High current draw with ignition off.

My 2002 GMS Sierra draws a simaliar amount of current.(.52 A). There a two items which draw current all the time on my truck. One is the OEM security system and I also have a wirless auto start unit. Both of these have a continouse draw on the battery. I've installed a high current marine battery switch to isloate this load if my truck will not be used for more than two weeks. Otherwise, the battery will be ecessivley drained. Regards, Jeff

Posted on May 03, 2009

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My battery keeps dying which I have replaced twice in 14 months. The alternator was tested and this is not the cause? Any suggestions would be greatly appreciated. Thank you


Not everyone knows how to test alternators adequately ... but that is not to say that whoever tested your alternator did anything wrong either!t

One of the most annoying situations to have in any vehicle, is a mystery drain on the battery. It could be something as simple as a light not turning off somewhere. A trunk light that stays on, a glove box light, or any other lighted enclosure, an under-hood light, or perhaps even a defective phone charge cable that draws current even if the phone is disconnected!

If you have a voltmeter anywhere, connect it across your battery, AFTER setting the correct range and function on the meter. The voltage will be 14.2 to 14.6 VOLTS (NOT AMPS!!!) with the meter connected across the battery terminals, the engine idling, and as many things turned OFF as you can control. If the voltage is 12 point something, when idling, either the alternator is defective or not turning!

Any multi-function meter you get will probably have some current ranges. If you are not afraid to, you could (with the engine off and cooled off), DISCONNECT one battery terminal. Then connect your meter (as a CURRENT meter), in series with the disconnected battery terminal. Read the meter, and that will tell you IF you have a drain on the battery, and how much drain (in amps).

Such meters are very low cost at places like Harbor Freight Tools! Well under ten bucks!

Apr 17, 2017 | Cars & Trucks

1 Answer

Charge overnight and the charge runs out without ever being used??


If the battery is good
You have a parisitic draw somewhere:

Switch your Digital Multimeter to DC AMPs. Amps is usually indicated by an "A" on the Multimeter Switch. AC is usually shown as a "~" symbol and DC shown as a "-" symbol. You usually have to move the Multimeter positive lead to a separate socket on the Multimeter. Sometimes there are 2 sockets, a high range and a low range. Always test on the highest setting first. For example: high setting on your multimeter may be 10 Amp. Test on the 10 Amp setting first, then if the current drawn is less than your Multimeter Low setting, move to that setting and keep testing. In my example my Multimeter low setting is 0.3 Amps. Also indicated as 300mA (mA x 1000 = A).

WARNING! Once the multimeter is on Amps do not connect it directly across the battery and do not hit the starter button while testing for current Amps. This will cause the internal fuse in the multimeter to blow! A multimeter set on current is a very low resistance, almost a short circuit and will draw as much current as your battery will supply till something melts. Always plug the Multimeter leads back to volts when you have finished testing to avoid blowing the fuse next time you use your multimeter.

Voltage ReadingTo test for battery drain: Switch everything off on the car. Disconnect just one battery lead. For example disconnect the Positive Battery Lead. Set your Multimeter to Amps as described above. Connect the Positive Multimeter Lead to the Battery Positive terminal. Make sure the Positive Lead you removed from the battery does not touch anything grounded, like the car frame etc…. Connect the Negative Lead from the Multimeter to the Positive Lead you removed from the Battery. You should now see current drain measured in Amps. Move to the lower Amp setting on your multimeter if the current is lower than the setting on the Multimeter Low setting. Start to unplug the wires or fuses around your car and see if the current reading goes to zero. This will point you in the direction of the current thief. You can convert to Power measured in Watts by multiplying it by the Battery Voltage. Power = Volts x Amps 4.2Watts or (12Volts x 0.35Amps).

Mar 24, 2017 | Cars & Trucks

2 Answers

How do you hook up amp meter for battery charger


DO NOT CONNECT IT to both poles + - !!! the amp meter have very small internal Ressistance, it blows of :) Connect it like in the picture d640b1d6-15c8-40ff-9dc1-eac0eb3b2a1f.png

Apr 16, 2014 | Cars & Trucks

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I have a 2008 Ford Ranger with a good battery, good connections, good alternator, etc. I have been trying to,figure out why the battery is draining overnight only. This happened twice and both times


Switch your Digital Multi meter to DC AMPs. Amps is usually indicated by an "A" on the Multi meter Switch. AC is usually shown as a "~" symbol and DC shown as a "-" symbol. You usually have to move the multi meter positive lead to a separate socket on the multi meter to check for amps. Sometimes there are 2 sockets, (a high range and a low range). Always test on the highest setting first. For example: High setting on your multi meter may be 10 Amp. Test on the 10 Amp setting first, then if the current drawn is less than your Multi meter's (low setting) move to that setting and keep testing. For example: On my multi meter the low setting is 0.3 Amps. Also indicated as 300mA (mA x 1000 = A).

Remove the battery's positive cable.

Connect the multi meter's positive probe to the battery's positive post while simultaneously holding the negative probe from the multi meter up in the air, to keep it away from anything metallic.

Place the negative probe of the multi meter on the end of the removed positive cable to complete the circuit.

That's right, you're putting a negative on a positive, but its ok, because if the drain is severe enough, you're most likely to blow a fuse or two, which will identify the problem area.

Above I said to remove the positive battery cable because that is the way I do it. You can do the same test with the negative battery cable removed. In fact for you that may be a better way to do the test, because there would be no way for any electrical issues to occur by accidently grounding the negative probe from the multi meter. i hope you understand what I'm saying here.

Mar 27, 2014 | 2008 Ford Ranger

1 Answer

Battery loses charge overnight


either you have a bad battery, dirty connections or you have a parasitic drain. go to your local parts store for a battery test .to test a parasitic drain you need a multimeter. disconnect your negative battery cable. put your meter in the amperage setting. hook one lead to the negative cable and the other lead to the negative battery terminal. make sure that the cable is DISCONNECTED from the battery or you will blow fuse in meter or blow meter. read your meter. if it is anything over .5 amps or 50mA then it will fail the test. to figure out where the drain is coming from start pulling fuses. pull a fuse and put it back before pulling another. if the readings drop below the .5a then the problem is in the circuit of the fuse you just pulled. from then on it depends which circuit it is to determine the problem.

Apr 10, 2011 | 1998 GMC Sierra

2 Answers

Power drains out of battery unless it is driven every couple of days. Battery is very hard to recharge.


Your battery is dieing. After time batteries don't charge as deeply or hold a charge as they once did. Replace your battery and you will no longer have the problem.

Mar 28, 2011 | 1983 Toyota Land Cruiser

1 Answer

Im not a mechanic and am familiar with my vehicle, the battery has been checked and is fine when hooked up it sparks but there is something severe that is draining the battery within an hour or two. It...


I do not think you have a short circuit because it would blow a fuse or burn the insulation off the wire and smoke a lot. Therefore, if the battery is being drained it could be a component pulling too much current when the vehicle is off. I have seen when the ignition is switched off the accessory power is in the on position, which will drain the battery. I find it strange that if you jiggle your cable the vehicle may start. This makes me think it could be a lose ground connection. You will have some components with constant power and if the positive or ground connection is loose or bad it will pull more current from your battery. So check connections to the block chassis and fuse bus first. If you obtain a multimeter (Volt-Ohm-Amp) and set it to amps to read current you can narrow the possible cause. Understand the meter may only read a maximum of 500 milliamps .5 amps or 10 amps so make sure the engine off so you do not max out your meter. Disconnect one end of your battery (Pos or Neg) and set your meter on amps and make sure you have your meter probes plugged in correctly to read amps. Connect one end of the meter probe to the battery cable and the other to the battery. You should see a reading on your meter. If you take a jumper cable and connect it to the vehicle chassis and the other end to the multimeter and the other multimeter probe to the negative terminal of the battery the current reading should be the same. If the reading is less then your ground connection on your vehicle is bad. Open the fuse box and randomly pull a relay and note the amperage reading on your meter. If you see the current drop note the relay and current reading on a piece of paper then replace the relay. If the current did not drop put a piece of masking tape on it to mark it as being tested. Now start pulling and replacing fuses again looking at the current reading for any changes noting the change on paper. Do the same for the fuse box and relays inside the vehicle. You can now see which components are pulling current when your vehicle is off which should help you find your problem.

Aug 17, 2010 | 1999 Chevrolet Blazer

1 Answer

Have tried 2 new batteries. car starts at once. runs smoothly. but when ignition is switched off for about 30 minutes, the battery goes dead! The alt. has been checked OK. The problem started when we...


The cause is most probably a current drain on the battery when the vehicle is switched off.

Check for a drain current from the battery while the vehicle is standing with engine and all electrical system turned OFF -
[ while in this condition, if you don't have a current meter, temporarily connect a small bulb (6-12W) in series with the main battery ground cable - lamp glow indicates current drain - remove fuses, disconnect items to identify cause of current drain],

Also check alterator output voltage (measured across the battery terminals) is approx 14.5V when engine is running and electric system is loaded with headlights or blower fan on.

Oct 28, 2009 | 1994 Toyota Camry

2 Answers

I own a nissan maxima 1997 , there is a problem, there is somthng killing my batterie , i checked all teh lights there is noone of them that stay on, my alternator seems to be cahrging good but i found...


The battery should never be disconnected while the motor is running - this can cause excessive voltages to appear on the alternator output.
That in turn could cause destruction of any electronic module on the vehicle, including damage to the alternator itself.
Assuming the electrical system has not been damaged, the cause of your discharge problem is most likely a current drain on the battery when the vehicle is unused.
Check for a drain current from the battery while the vehicle is standing with engine and all electrical system turned OFF -
[ while in this condition, if you don't have a current meter, temporarily connect a small bulb (6-12W) in series with the main battery ground cable - lamp glow indicates current drain - remove fuses, disconnect items to identify current drain],

Also check alterator output voltage (measured across the battery terminals) is approx 14.5V when engine is running and electric system is loaded with headlights or blower fan on.

Oct 20, 2009 | 1997 Nissan Maxima

1 Answer

Looking to find the correct specs to adjust a TPS for a 1994 Mazda 929. Using a multi-purpose voltmeter.


YOU NEED 2 VOLT METERS.FIRST OF ALL START ENGINE.LET IT GET OPERATING TEMPERATURE THEN TURN OFF ENGINE.THEN YOU CONNECT TWO VOLT METERS TO THE TEST CONNECTOR.TURN IGNITION ON AND CHECK THAT CURRENT FLOWS TO ONLY ONE VOLT METER.IF BOTH VOLT METERS SHOW CURRENT FLOW REMOVE THE CAP AND TURN THE ADJUSTING SCREW COUNTERCLOCKWISE UNTIL ONE VOLT METER SHOWS CURRENT.IF NO CURRENT IS REGISTERED BY EITHER VOLTMETER TURN THE ADJUSTING SCREW CLOCK WISE UNTIL ONLY ONE VOLT METER SHOWS CURRENT.INSTALL THE CAP ON THE ADJUSTING SCREW AND DISCONNECT THE THROTTLE SENSOR CONNECTOR.CONNECT AN OHM METER TO THE THROTTLE SENSOR TERMINALS.OPEN THE THROTTLE VALVE AND CHECK THE RESISTANCE READING FROM THE THROTTLE SENSOR.AT IDLE THE THROTTLE SENSOR SHOULD SHOW ABOUT ONE KILO OHM RESISTANCE.AT WIDE OPEN THROTTLE THE SENSOR SHOULD SHOW ABOUT 5 KILO OHMS RESISTANCE.ANY RESULTS OTHER THAN THESE.REPLACE THE THROTTLE SENSOR AND RETEST.

Aug 26, 2009 | 1994 Mazda 929

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