Question about Jeep CJ5

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77 CJ5 hot alternator after being shut off for hours. Battery drained. Amp meter pegged.

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The diodes in the alternator and/or regulator are most likely to be the problem. Remove the alternator and have it tested at your local parts house. This is a free service.
Good luck..i hope this helps.

Posted on Jul 27, 2009

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Posted on Jan 02, 2017

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2002chevroletz71.Something is draining the battery after setting for 5-6 hours. Battery(new)starter,alternator all check good,even disconnected alternator. The truck is well equipped but everything se


No-- it appears that something is NOT turning off or
going to sleep

Google or You Tube Video how to do a Parasitic
Current Drain Test

Remember once you close all doors, they stay closed
or your starting over

It may take a half hour before modules time out

Best you have a wiring diagram & an amp clamp or
volt meter, to put into one of the battery cables, to watch
for the drain (MilliAmps) as you remove the fuses to isolate the circuit with the problem

The alternator diodes were checked out with a scope
or checked for leakage?

Nov 20, 2014 | Cars & Trucks

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I have a draw on the battery on my 85 Toyota pickup it kills a fully charged battery in about 2 hours... Ive put a volt tester between the disconnected positive battery cable and the positive battery post...


Go to You Tube Video & see how to do a parasitic CURRENT
drain test

What you have done so far with a test light & volt meter is basically
doing nothing

You need an amp meter & a wiring diagram,then pull fuses one
at a time, to get to the circuit that causes the drain,then use the
prints to test that circuit for voltage drops

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Nissan 2002 Pathfinder is draining its battery


If it's clicking, it's not a fuse , its a Relay. Relays Do sometimes stick. Or it can be clicking due to low voltage that was caused by something else.

To see if that's your issue, charge the battery, take the Relay out of the car and see if the battery stays charged after 12 hours.
If teh battery stays.. then first step is to replace the relay.

Dec 24, 2012 | 2002 Nissan Pathfinder

2 Answers

My car battery keeps getting drained. what is draining my battery.


Are you sure that you have a problem with something draining the battery, or do you have a problem with the alternator not charging the battery? I would have the alternator tested to make sure of that before spending hours and hours troubleshooting electrical problems.

Basically, to check a problem like this you will need a clamp on amp meter. Then you pull fuses from your fuse panel and see where the drain is. Make sure you have a good layout of your fuse panel and fuse sizes (a digital photo is also a good idea) before starting, so you don't introduce problems.

Jun 26, 2011 | 2000 Volkswagen Jetta TDI

1 Answer

Mercedes E320 CDI 2004 AVENTGARDE.If i leave the car standing for more than 2 days the battery drains & i can't even open the central locking due to no power from the battery.The battery was...


Find your fuse panel. Take a picture of it with your cell telephone. With the car off, with a volt meter, remove the fuses one at a time. Measure every slot to find out what is hot and what is not. Any Hot circuits should be examined closely to find out what is ON when the car is OFF.

Places to look ... light in the trunk??? is it on or off with the lid closed? Under the hood? Same. Do you have a radio that comes on with the key off??? GPS, you leave plugged in? Cell phone or other gadgetry you may have plugged in to the aux power supply? Any other lights? Parking lights for example? Security system? CB radio?

After you have checked these items, and if you find nothing, you may want to have your alternator examined. If you have a shorted diode in the alternator, the power may be draining back to ground through this shorted diode. You could perform this test yourself by unplugging or disconnecting the alternator during the periods when you are not driving the car. If this is the trouble, on day three, when you reconnect the alternator, two things you will note: 1) there will be a pretty big spark & 2) you will still have charge in the battery (evidenced by the spark)(there will be some spark no matter what ... but a big spark will mean a big drain). I have seen shorted diode problems fixed by inserting a toggle switch in the alternator power circuit. The alternator will still charge the battery when the switch is ON with the car running. When you stop the car, turn the switch off, power will not drain through the alternator to ground. Probably not the solution for your Mercedes. The real solution is to replace the alternator.

BTW - do you have a security system in your car? A thief proof radio? Check your owner's manual for precautions you should take before disconnecting your battery with regard to the anti theft features of your vehicle.

You say your battery is new and dead after three days. If fully charged on day one, and dead on day three, that means your battery has expended between 500 (economy battery) and 1000 (premimum battery) "amp hours" of power (500 amps / 72 hours = about 7 amps per hour going somewhere. (An 'amp hour' is one amp for one hour) Ohm's Law applies.

I hope you find your trouble and I hope I have given you a few leads. Thanks for allowing me to assist you with this problem this morning ... good luck.

Thanks for using FixYa.com today.

Jun 20, 2011 | Mercedes-Benz E320 Cars & Trucks

2 Answers

Battery runs down after setting for 48 hours . Has new battery


Generally when a battery keeps dying even after replacement one of two things is the problem. Either the alternator or alternator belt (however, if this was the case, one would think it would die while driving down the road) OR Something is drawing power that shouldn't be, for example, let's say the switch that shuts off the light in the trunk is broken, so the light is staying on all the time and you may not be aware of it, constantly draining the battery. A quick test for the alternator is to visually inspect the belt, check belt tension. Measure battery voltage using a multimeter, start vehicle, measure battery voltage again, it should be higher than when you measured it with the vehicle off, this is a decent indicator that your alternator is working. To test for a drain on the system, first shut everything off. This includes lights, radio, taking out the keys, closing the doors, turning off headlights, heater, etc. To measure the drain, you must remove the positive battery cable from the battery. Connect a multimeter capable of reading amps DC in series between the positive battery post and the positive battery cable. If you have more than half an amp, you probably have a drain on the battery. Now, with the meter still connected in the manner described, you must remove fuses one by one until you determine which circuit the problem is on (excessive current reading on the meter goes to acceptable levels). This website has a very good description with a few pictures and other information about battery drain:
http://flashoffroad.com/electrical/Batteries/BatteryDrain.html
After determining which fuse the drain is on, you must determine what is now not working (hopefully your fusebox has a diagram on the lid, most do) and troubleshoot that circuit.

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this is caused by a failing alternator. Kragen auto and Autozone tests these for free.

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battery needs to be replaced. Have the battery check for cca.. cold cranking amps

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turn on ur car let it run then take the hot wire off the battery and it still runs then you have a powerssoucre such as an after market radio or just a hot wire to something thats giving it constant power and draining ur battery

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