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How to set for parasitic testing ?

Car battery will not start car after setting for 12 hrs

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Posted on Apr 20, 2017

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Posted on Jan 02, 2017

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2003 nissan altima 2.5L 4 CYL would'nt w'out jump.replaced battery and car was fine for two days. On day 3 , after car was sitting for 15 hrs dead again!garage cant find whats drawing when car is off


Do you see a brake light on while driving? That could be a bad alternator.

Ask your garage to perform a parasitic draw test - you could do this with a multimeter, as well; it sounds like something is draining your battery while off - it could be any fuse and not obvious like with lights on/etc.

I would 95% positively guess this is the issue due to time frame. If the garage doesn't know what this is, take her somewhere that does. Shouldn't be costly, either.

Apr 19, 2017 | Nissan Cars & Trucks

1 Answer

98 Jimmy has a power draw it kills the battery within 12 hrs if you pull the 50 amp fuse for the int batt draw goes away any ideas


Yes Steve I do , that fuse supply's power to the I/P fuse block inside the vehicle . It powers AUX/PWR fuse #13 -20amp , RDO/BATT fuse #19 - 15amp ,MIR/LKS fuse #7 - 5amp , CTSY/LP fuse #8 - 15 amp , CIGAR/LTR fuse #2 15 amp , PWR/LKS fuse #14 15 amp , HDLP/SW fuse #1 - 10amp .Do you know where the I/P fuse block is ? You would need to do a parasitic draw test ! This involves hooking up a amp meter in series with the negative battery post an negative battery cable . Pulling each one of these fuses till the battery draw stops ! How To Perform Parasitic Draw Test EricTheCarGuy check out Eric the car guy's video on the subject !

Sep 14, 2015 | Cars & Trucks

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Battery on my 2003 ford expedition seems to drain overnight, had it checked but the tech said the voltage was ok and also checcked the altonator. I thought it might be my automatic lights set to auto and...


Any idea what might be draining the battery ? That would be guessing , doing a elecrical test, parasitic drain or draw . Checking for current flow over the fuse's till you find to much current draw is the easiest way . We test , not guess . Guessing cause the replacement of parts that don't need to be replaced .
Improved Methods to Find Parasitic Draw Battery Drains Overnight
The BEST Way TO Perform Parasitic Draw Test
How To Perform Parasitic Draw Test EricTheCarGuy


Jan 07, 2018 | 2003 Ford Expedition

3 Answers

After putting inn a new starter, new battery, and battery fuse my car starts sometimes. I can start it and go somewhere and then go to leave and it won't start. A jump does start it.


I would have the think its the alternator. If a jump starts the car, maybe the alternator isnt charging the battery properly. If you can take it off, Auto Zone, and places like that will test for free. Also, start your car and put a volt meter on you battery. You should be makin 14ish volts (14.4). If its making less (like 12-13) id def say its the alternator. (make sure everything is off in your car when you take the volt reading. Heater,lights,stereo,headlights.... Everything)

Jan 20, 2011 | 1995 Honda Accord

1 Answer

Battery goes dead in 8 hrs..disconnected battery/alternator/starter/computer.(each one at a time.) Has a "parasitic drain". Cannot do onboard diagnostic..service engine sign not lit. Now, truck has started...


If you have a multimeter then put the negative lead to a good frame ground and the positive lead to the negative battery terminal and set the multimeter to measure 12VDC. With a "parasitic drain" you should be able to see some voltage. Next start by removing then replacing one fuse at a time and when you remove the fuse for the circuit with the drain you should no longer be able to see a voltage reading on the multimeter. Check which system the fuse was for and then isolate which component in the circuit has the problem.

Jan 26, 2010 | 1996 Chevrolet Silverado 2500

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