72 lb battery killer - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dutsuno · 07-13-2010, 04:40 PM

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!

raycow · 07-13-2010, 05:31 PM

Does your horn work normally?

Ray

dutsuno · 07-14-2010, 06:02 AM

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?

**truckdude239** · 07-14-2010, 07:17 AM

the diodes in the alt could be bad pulling off the battery when they truck is off

fixit-p · 07-14-2010, 09:49 AM

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.

raycow · 07-14-2010, 12:44 PM

Quote:

Originally Posted by dutsuno

no the horn does not work.

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

Longhorn Man · 07-14-2010, 11:41 PM

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.

dutsuno · 07-25-2010, 06:31 PM

k . i took a volt meter to my alt. its charging the battery. but ther is still a drain. any ideas fellas??

Longhorn Man · 07-25-2010, 11:07 PM

what was it charging at... 12.5, or 13.5?

dutsuno · 07-26-2010, 02:33 AM

i believe it was higher round 14.5. ill have to check it again to b 100% sure

raycow · 07-26-2010, 02:39 AM

Quote:

Originally Posted by dutsuno

k . i took a volt meter to my alt. its charging the battery. but ther is still a drain. any ideas fellas??

Have you tried unplugging the horn relay yet? I'm not saying that's the only possibility, but it sure won't cost you anything to try it.

Ray

dutsuno · 07-27-2010, 04:15 AM

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???

Longhorn Man · 07-27-2010, 06:32 AM

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.

Hoods69BadBowTie · 07-28-2010, 06:22 PM

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?

07-13-2010, 04:40 PM	#1
dutsuno Registered User Join Date: May 2010 Location: phoenix Posts: 52	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!

07-13-2010, 05:31 PM	#2
raycow Registered User Join Date: Mar 2003 Location: San Francisco, CA USA Posts: 2,454	Re: 72 lb battery killer Does your horn work normally? Ray

07-14-2010, 06:02 AM	#3
dutsuno Registered User Join Date: May 2010 Location: phoenix Posts: 52	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?

07-14-2010, 07:17 AM	#4
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,220	Re: 72 lb battery killer the diodes in the alt could be bad pulling off the battery when they truck is off __________________ 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

07-14-2010, 11:41 PM	#7
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	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.

07-25-2010, 06:31 PM	#8
dutsuno Registered User Join Date: May 2010 Location: phoenix Posts: 52	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??

07-25-2010, 11:07 PM	#9
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: 72 lb battery killer what was it charging at... 12.5, or 13.5?

07-26-2010, 02:33 AM	#10
dutsuno Registered User Join Date: May 2010 Location: phoenix Posts: 52	Re: 72 lb battery killer i believe it was higher round 14.5. ill have to check it again to b 100% sure

07-27-2010, 04:15 AM	#12
dutsuno Registered User Join Date: May 2010 Location: phoenix Posts: 52	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???

07-27-2010, 06:32 AM	#13
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	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.

07-28-2010, 06:22 PM	#14
Hoods69BadBowTie Chevys Kick A$$ Join Date: Jan 2005 Location: Zootown, MT Posts: 12,699	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? __________________ HOODS is what I answer too -'79, '77, '88 Pickup Sold, '85 Camaro, '83 T/A, '81,'83,'90 K5 Blazer All Sold -'79 3/4 ton "Big Yellow Bananna" Lifted 4spd. 39.5 TSL Swampers, The money Pit -'86 K5 Blazer Silverado 6.2 4" lift 35"s -'95 Ext. Cab Shorty 4" Tuff Country rolling 35" M/T's -'83 Monte Carlo T-Tops. 126,500 Original Miles -LATER I would rather push a Chevy then drive a ford!! Last edited by Hoods69BadBowTie; 07-28-2010 at 06:23 PM.



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