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Discussion Starter · #1 ·
I have a 85 Chevy 4x4 pu. if you turn the key off and leave the truck for about 6 hours the battery gose dead. It has a brand new battery and the alt. seems to be good. You can drive the truck all day long start it as many times as you need but park it for a 6 hour period and the battery is dead. Any help or suggestions would be great. Thanks Jim.
 

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85, is that a TBI motor? I think 86 is when they kicked in. If not, check your Voltage Regulator. They go bad and get stuck "on" so it's feeding the coil 12v all the time even when the key is off. That's usually the culprit. Easy to check. With key turned off, put a VOM on both sides of the coil, if you get 12v, it's the regulator.
 

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How about if you unhook one of the battery terminals? If not then you have a drain in your electrical somewhere. Try pulling fuses until it stops. Hook up an amp-meter to see when the drains stops...

Could even be the alt if a diode is shorted... you "think" its good or you "know" its good? I think it will still charge this way too...

If it still goes dead w/ a terminal removed, wash of any acid, etc. from the outside of the battery. The acid will conduct electricity and drain it too. (but you said it was new, so that's less likely).
 

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Discussion Starter · #4 ·
Thanks for the information I am going to check the coil right now. And if I disconect the neg. side of the battery it dosent drain. Once again thanks for the help. Jim Aka Wilseya.
 

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Unless it's wired wrong the coil will have NO power with the key off.
What's the last mods done to the truck? You have a cell phone mounted to the truck or plugged into a Cig adaptor if it's portable?
Big tunes?
Most battery drains are traced back to aftermarket gear like Stereo's and stuff like that.
Any other electrical problems like Dome not working?
Other things to check is the wires by the starter. On GM trucks the battery cable runs from Battery to Starter and at the starter is where the rtest of the electrical system get's it's feeds. Sometimes the wires will get up against the Exhaust and short. sometime if the motor or tranny are pulled the wires get pinched between them when reassembled and damaged. There will be 2-3 Fusible links down there. If there is Tape or crimp connectors on any of them then the fusible link has been blown and replaced. If the Fuse links are unmolested you will finde a plastic lump molded to the wire on either side of the fusible links. They may have replaced it with regular wire out of Stupidity.
Also trace the wires back from the alternator and make sure it's not shorted out on something. There is a harness that runs over the back of the block at the bellhousing that can also get caught and piched between if motor or tranny are removed and installed.
 

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Discussion Starter · #7 ·
Thanks Grim reaper
Their has been no mods done to the truck no stero or cell phone, the engine is stock and to my knowledge has never been removed. This has go me puzzeled all of the lights work and shut off. I just dont know where to begin. Thanks again for all the help. Jim aka Wilseya
 

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Wilseya

You might have overlooked the easy stuff. Mine did the same thing. It was the stupid little light under the hood. <IMG SRC="smilies/rolleyes.gif" border="0">
All I did was unplug it. My problem solved. <IMG SRC="smilies/biggrin.gif" border="0"> Look for the dumb stuff too.

[ 10-10-2001: Message edited by: BellyUp ]
 

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Originally posted by Wilseya:
<STRONG>Thanks Grim reaper
Their has been no mods done to the truck no stero or cell phone, the engine is stock and to my knowledge has never been removed. This has go me puzzeled all of the lights work and shut off. I just dont know where to begin. Thanks again for all the help. Jim aka Wilseya</STRONG>
Since the truck is unmolested I would lay odds on a bad Diode in Rectifier in the Alternator. You could pull it and have it tested at most parts stores or if you want to figure it out yourself then Disconnect the battery. Take the big wire off the back of the alternator and tape it up. Unplug the field wire out of the side. Hook the battery back up. If its a problem with the alternator you should not have a dead battery in the morning.
 

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I have the same problem as you so I put a quick release on the positive terminal. That was how I figured out where the short was. When I would connect 1 wire it would arc to the terminal. If the draw is really low you may not see it, but if it's draining your battery in 6 hours than you should see an arc. Good luck.

Milan
 

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Stupid thing my scout did to me was The horn relay was stuck on. I dont have a horn on it but the relay staying open for some reason killed my battery :shrug: I unplugged the relay and all it good might want to check that out if you dont have a horn.
 

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Do you have an alarm? What about a clock? Either one could be shorted.
Pull allthe fuses, disconnect all the wires on the starter.Put an ampmeter inline with the negative cable. Hook upo the wires at the starter one at a time until you see the ampmeter shows current or all the wires are connected. If it shows flow when you connect one of the wires, follow that wire to the short, it could be just one little strand touching a ground.
If there is no flow w/ all the wires connected, start installing one fuse at a time, checking for current flow after each fuse, leave the fuses for the alarm & the clock for last. When you see the current start flowing, follow the wiring to th short.
Have fun! <IMG SRC="smilies/biggrin.gif" border="0"> <IMG SRC="smilies/usa.gif" border="0">

[ 10-11-2001: Message edited by: JeepinIan USA ]
 

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Originally posted by JeepinIan USA:
<STRONG>Do you have an alarm? What about a clock? Either one could be shorted.

[ 10-11-2001: Message edited by: JeepinIan USA ]</STRONG>
CLOCK!!!!!!
JeepinIan is right. Check that for sure. My clock crapped out and was killing the battery. I completly forgot about that. Had it happen in my 70 Pontiac also. The clock is a accessory and even though it's in the cluster it has a seperate power wire and you can unplug it at the back of the clock. Mine in the truck if you put your ear up next to the dash you could hear it making a slight buzz.
 

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I had the same problem with my rig, battery would die after sitting for just a few hours (brand new battery too). Turns out it was the voltage regulator, $12 or so part. Take your rig over to Kragen or some autoparts store, have them come out and do a test on it, they can probably find it. <IMG SRC="smilies/smokin.gif" border="0">
 

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Do what Eric said and you will narrow it down fast. Unhook your + cable, hook an ammeter (or a test light) up between the + terminal and the cable. Any short to ground in your electric system will show as a - on the ammeter or a dim glow on the test light. Pull fuses one at a time until that drain goes away...thats the circuit with a short to ground in it. Then just follow that circuit doing the same test until you find the shorted wire/bad switch etc. If its not one of the fuses then its a component in the starting/charging system. One step at a time and you will have it tracked down in an hour or so.
 

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I had the exact same problem , traced it to the clamp. Changed the clamp and the ground wire and it works OK now.

I thought it was the battery so I replaced it , then had the Alternator checked . All the lines and stereo checked but it ended up being the clamp and positive terminal getting corroded.

Robert VanLane
 

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Discussion Starter · #17 ·
I just wanted to take a moment and thank all of you for your help as it turned out it was the Alt. and I replaced it and the truck runs fine thanks again.
Jim Aka Wilseya
 
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