Question about 2003 GMC Sierra

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2003 GMC1500 Marker lights &licence plate lights are draining Bat

Whent to start truck and found batery dead, charged up and found licence plate lights and front marker lights do not shut off. What can cause this.

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Check park lamp relay its in that circuit if stuck close it will effect those lights.that circuit hot all time.if close lamps stay on.

Posted on May 24, 2009

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Posted on Jan 02, 2017

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My alitnator pump around 13.5 when running could that be over chargin my batery,, if i dont drive it for a couple days my bat is dead i charge it but there not enough amps to turn over,, i bought a new...


should charge at more like 14.2 volts running. Don't know what year it is ,diag on a chrysler product is usually simple.Earlier firewall mounted regulator ? ground the striped wire (white,green stripe I think)Should charge like 15-18 volts with the wire grounded Later engines the regulator is in the alternator. Have to change it.
Needs to charge harder than 13.5 tho.

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Got new head gasket installed-not related to prob.after that bat.went dead,new bat and alt. still drains bat overnight. could it be a short in starter?


Check the main alternator fuse. It is either a block fuse in the fuse box under the hood or it is built into the positive battery terminal. If it is blown your battery will not charge even though everything else is in perfect working order and the alternator light(charge light) on the dash will not light up to tell you there is a problem. You will drive a short distance and the battery will go dead. After recharging it will start right up run OK till it runs out of juice again and dies, etc. Find the fuse and check it is not blown. It is a frustratingly simple fix to a hard to diagnose problem.

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Where is tail light fuse in 1996 chevrolet silverado pickup


Left of the steering wheel & under the dash is the fuse panel for this. No.9 is for the tail lights, but also for many other lights such as licence lamp/parking lamp/side marker/tail gate/etc...
There is also an under the hood fuse/relay panel, but it does not have the tail light fuse in it.

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Licence plate lights


I believe you'll have to reach under the bumper to get to the lights.. just twist and pull...

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What could be dragging my battery down after 2 days of not starting it?


Lots of stuff. An after market alarm,malfuntioning radio,bad battery,bad door pin switch for the interior lights. Best thing to do is charge the battery if it's in fact good, thenunhook the negative battery cable & connect a test light from the disconnected cable to the negative battery post. If it's a nice bright light it's got a draw. If it's really dim,that's the memory for the computer,anti-theft,radio memory. I mean dim,like barely lit! That's ok. If you don't have a test light disconnect the negative cable & touch it to the negative battery post a few times & if there's a big spark,there's a draw. If there's a draw & there's nothing on in the car,like an interior light,etc, than start with the inside the car fuse box & while holding the open door pin switch test each fuse for power. If anything has power that shouldn't with the key off that's where to start. Do the same for the under the hood box as well but disconnect the hood light. If you are using the Viper alarm system,junk the system. That alarm causes your problem & in alot of cases a fire.

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1 Answer

Dead battery won't hold a charge


Replace battery if it doesn't hold charge. make sure, that its not getting drained by something beeing on. You can do a fast test. remove negative batery terminal and run a test light between the negative cable and battery post. see if test light comes on. If it does, you have a draw on the system thats draining the battery. Then you will need an DVOM /digital volt meter and check how many amps you are drawing out of the battery. But its probably just a dead battery. Replace it. Good luck.

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