How can I tell if my car is draining juice from the battery ? - Team Camaro Tech
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post #1 of 5 (permalink) Old Jan 29th, 07, 07:11 PM Thread Starter
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Robert
 
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How can I tell if my car is draining juice from the battery ?

Hey guys I had a Duralast in the 67 , but when I would park it for 2 or 3 days .. it would go dead. So I went and bought a Die Hard thinking those Duralast are no good , and it does the same thing.... Nothing stays on , on the car ... when I bought her ... it had an aftermarket cassete radio .. the one with knobs... and next to the fuse box.. I have 3 wires that are tapped in on the sides next to the glass fuses. There are 4 slots .. the two on the top have a wire connected to it , and the slot on the bottom has a wire connected to it . It does have an electrical fan and comes on when it gets hot but it turns off .. dunno what could be draining it. the alternator is charging good by the looks on the gauge. any help . ??

thanks
Rob.
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post #2 of 5 (permalink) Old Jan 29th, 07, 07:17 PM
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Re: How can I tell if my car is draining juice from the battery ?

A real easy way to check if you have something drawing current when the car is turned of is to disconnect the neg batery cable. Then get a test light and connect the aligagtor clip to the the neg cable and then touch the oter end to the neg post on the battery. If the the test light ligts up, you have something pulling current.

Then you can start pulling fues one at a time from the fuse box till the light goes out. That will let you know what is pulling the current, and isolate the short.

I hope this helps
Nick
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post #3 of 5 (permalink) Old Jan 29th, 07, 07:39 PM Thread Starter
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Robert
 
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Re: How can I tell if my car is draining juice from the battery ?

Hey Nick thanks for the FAST reply I will try that right now . I knew there was something with the test light and the battery but I did'nt exactly know ......... thanks again Nick .
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post #4 of 5 (permalink) Old Jan 29th, 07, 07:44 PM
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Jim
 
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Re: How can I tell if my car is draining juice from the battery ?

You can do like Daytona Yellow 69 Z/28 (Nick) stated and if you do not find anything drawing current with the removal of battery circuit fuses in the fuse block then you could have a problem with the alternator. On this with the test light inline like on your first tests, disconnect the output wire on the stud on the back of the alternator. Most of the terminals on the fuse block should be protected by a neighboring fuse in the fuse block but if not, disconnect anything plugged into it.

If for some reason you find no current draw then it's possible the alternator even though you might be thinking it looks good with the gauge may not be charging properly. For this you will need a volt meter. With the car off measure the voltage across the battery terminals and write that figure down. Now start the car and measure it again and then at a high idle and then with things on you use like headlights, air conditioner/heater blower on high and see what it reads. You need at least one volt over what the battery reads when the car is off. If it's only 1/2 a volt or the same then the alternator is not charging the battery.

Jim

1974 Spirit Of America Nova (being restored), 1973 Nova Custom, 1968 Chevy II (Garage Find 2012)

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post #5 of 5 (permalink) Old Jan 30th, 07, 12:11 PM
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Re: How can I tell if my car is draining juice from the battery ?

A note on radios/cassetes
Very old stuff had 1 power wire, this could be connected into the access circuit (only operates with key on) or power cuirut, will work with key on or off.

Then there is the older red and yellow power wires...again these 2 could be wired together and done as above

I resent yrs they still have a red and yellow, one (think it is the yellow) has to go to the accees circuit and the other to power on with key off)
If u connect up the wrong or both to the power, your battery will go low over night.
http://www.jowett.org/forum/viewtopic.php?p=1582#1582

My Spelling is not incorrect...it is creative

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