battery drainage - Mercedes-Benz Forum

 
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post #1 of 6 (permalink) Old 12-23-2009, 10:23 AM Thread Starter
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Exclamation battery drainage

me again....

72 250

my battery just keeps dying. alternator checked ok. battery checked ok.

thinking it may be voltage regulator. any way to test before i buy??

also. my wife noted that this started after i installed the radio. i had to use the hot wire from the cigarette lighter lighter. but i didnt hook the lighter back up, just the hot, not the ground. could that be the culprit?


thanks
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post #2 of 6 (permalink) Old 12-24-2009, 03:34 AM
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Don't voltage regulators come as part of the alternator?
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post #3 of 6 (permalink) Old 12-24-2009, 08:35 AM
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Simply disconnect the radio for a week & see if battery drains

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post #4 of 6 (permalink) Old 12-24-2009, 07:24 PM Thread Starter
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idk if its part of it or not. it was suggested by a friend. when the lights are on i can see then actualy dying in front of me when i turn on my turn signals. when i put on my brakes all the lights dim etc.

i have disconnected the radio for now, but the batts still dead, i need to jump it or charge it up to check it that could have been it.
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post #5 of 6 (permalink) Old 12-25-2009, 09:00 AM
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Equipment required:-
Multimeter - very cheap item available in all electronics stores
Basic tools like screwdriver & pliers/spanners

Steps to check if the car's electrical devices are draining the Battery are as follows:
1) At night time where it is dark Switch off the car and remove the keys
2) Loosen and remove the positive terminal of the battery
3) Looking carefully slightly touch the terminal on the battery positive contact. There should be no sparks If there is spark it means that even when ur ignition is switched off there is some device in the car eating the battery.

Do this & tell me exactly what you observe.

Steps to check the Dynamo are as follows:
1) Get hold of a "multimeter" set its dial counter-clockwise to DCV 20.
2) Stick in the red tester lead into the battery positive pole & stick the black tester lead into the batt negative.
3) The reading on the multimeter will show 12Volt
4) Now ask someone to start the car & carefully watch the multimeter. As the starter takes away the battery amperage momentarily the voltage will drop to 10V. But as soon as the engine fires up it should show 14V
5) Now switch on the headlamps, the voltage should immediately increase to 14.5 to 15V

Inform me exactly what readings u get & I will tell you the interpretation.

Steps to check the Battery are as follows:
1) Fully charge-up the battery. Check its voltage with multimeter it should be 12V
2)DONT install it in the car. Just put it on a wooden table (Dont leave it on the floor or on metal/RCC/ concrete automatically drains the batt.
3)Leave it on the table for 1 week and everyday check & write the voltage. If the battery is bad as time goes by voltage will fall.

Keep in touch. PS you have mentioned that u keep charging the battery. When it is connected to the charger open all the water caps & see if each of the six holes have fizzy bubbles in them. If any one hole does not have fizz in it that means that cell is bad

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post #6 of 6 (permalink) Old 12-27-2009, 09:53 PM
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Quote:
Originally Posted by Joshua Lomax View Post
idk if its part of it or not. it was suggested by a friend. when the lights are on i can see then actualy dying in front of me when i turn on my turn signals. when i put on my brakes all the lights dim etc.

i have disconnected the radio for now, but the batts still dead, i need to jump it or charge it up to check it that could have been it.
You're really going to need to do a current test to see exactly what is going on. Use a meter with amperage measurement, and be careful not to overdrive it, and put it in series with one of the battery terminals and the battery.

Once you know how much (if any) current is being drawn at rest, you can start to diagnose this.
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