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#1 |
Registered User
Join Date: May 2010
Location: phoenix
Posts: 52
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72 lb battery killer
bought a brand new battery. it died within 24hrs. didnt evn hav enough juice to turn the lights on. this is the 3rd battery ive gone thru. any suggestions on y it is sucking power while the truck is off??? thanks guys!
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#2 |
Registered User
Join Date: Mar 2003
Location: San Francisco, CA USA
Posts: 2,454
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Re: 72 lb battery killer
Does your horn work normally?
Ray |
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#3 |
Registered User
Join Date: May 2010
Location: phoenix
Posts: 52
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Re: 72 lb battery killer
no the horn does not work. but i have a battery charger that has an alternator checker. n it gave me a code that read the alt. was bad. could the horn relay b causin it to do that?
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#4 |
Senior Member
![]() Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,234
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Re: 72 lb battery killer
the diodes in the alt could be bad pulling off the battery when they truck is off
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David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
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#5 | |
Registered User
Join Date: Dec 2008
Location: Yay Area CA
Posts: 2,329
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Re: 72 lb battery killer
You have a key off drain follow this thread to test http://67-72chevytrucks.com/vboard/s...ad.php?t=33198 the previous two posters named some common key off drains so as part of the test also unplug the horn relay and alternator.
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#6 |
Registered User
Join Date: Mar 2003
Location: San Francisco, CA USA
Posts: 2,454
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Re: 72 lb battery killer
Then there is a good chance that this is where your problem is. Disconnect the plug-in connector at the relay and see if the drain stops. The relay itself likely isn't bad, but the wire going from the relay to the steering wheel could be shorted to ground at some point, causing the relay coil to draw power all the time. If the relay feels warm when you touch it, this is a sure sign.
Ray |
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#7 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: 72 lb battery killer
if the machine says your alt is bad... I would start there.
While the engine is running, and not charging the battery, then you are running directly off the battery and running it down, untill it is dead. |
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#8 |
Registered User
Join Date: May 2010
Location: phoenix
Posts: 52
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Re: 72 lb battery killer
k . i took a volt meter to my alt. its charging the battery. but ther is still a drain. any ideas fellas??
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#9 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: 72 lb battery killer
what was it charging at... 12.5, or 13.5?
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#10 |
Registered User
Join Date: May 2010
Location: phoenix
Posts: 52
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Re: 72 lb battery killer
i believe it was higher round 14.5. ill have to check it again to b 100% sure
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#11 | |
Registered User
Join Date: Mar 2003
Location: San Francisco, CA USA
Posts: 2,454
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Re: 72 lb battery killer
Quote:
Ray Last edited by raycow; 07-26-2010 at 02:42 AM. |
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#12 |
Registered User
Join Date: May 2010
Location: phoenix
Posts: 52
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Re: 72 lb battery killer
no. because i thot it was the alt. but ill give it a go tomorrow. do i unplug all three wires? i believe thers a black ,red, green???
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#13 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: 72 lb battery killer
its a single plug, they'll all three come off together. Listen for a click insude the relay as you unplug it. If it cliks, then you found the problem.
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#14 |
Chevys Kick A$$
Join Date: Jan 2005
Location: Zootown, MT
Posts: 12,699
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Re: 72 lb battery killer
If your alternator is good and charging your battery then you got a serious power drain some wheres in your system. You gotta stuck going through everything I would start with simple stuff first and go from there. Do you have an aftermarket stereo stuff or light stuff in your truck that is wired to a constant hot?
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![]() Last edited by Hoods69BadBowTie; 07-28-2010 at 06:23 PM. |
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