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!

Re: 72 lb battery killer
 

Does your horn work normally?

Ray

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?

Re: 72 lb battery killer
 

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

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.

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

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.

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??

Re: 72 lb battery killer
 

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

Re: 72 lb battery killer
 

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

Re: 72 lb battery killer
 

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

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???

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.

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?