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MY battery light has been flickering on and off for the past few weeks had alternator and batteries tested on my way by autozone they said it was all good and a little bit ago dash board cluster and radio went dead for a few seconds than flicked back on went back off for a split second and have been on since than but the truck never died
any places to start looking
 

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Check all the connections. Make sure they are clean and tight. Especially the single one on top of the alternator, It like to break loose and still appear good.

Also, did they disconnect the batteries and test them seperately? Did you have a load test put on the alternator?
 

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No they did not disconnect them. He hooked it to the alternator with the truck running he said everything read fine, so i turned the truck off and he tested each battery individually he did mention something about the battery on the driver side showed 100% charged but the one on the passenger side showed 97% charged. could that be enough to set off my battery light
If i get an ohm reader i should be able to do this.
Do you know what reading i should get off of the battery I am far from being a mechanic
 

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The ONLY thing that will turn on the battery light is the voltage regulator ON the alternator (unless you have an 02-03 truck-not listed).

The regulator can still work fine....but the control circuit for the bulb can have problems.
 

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The ONLY thing that will turn on the battery light is the voltage regulator ON the alternator (unless you have an 02-03 truck-not listed).

The regulator can still work fine....but the control circuit for the bulb can have problems.
Or the fuse (I think its number 6 or 5 under hood (depends on alternator setup and truck year.) Or the connector to the Alt is bad, the wire should have 14+ volts if you unhook it from the truck and test while running (although mine shows about .2 volts lower than battery/charging voltage the light is not on.)

Also test the wire from the fuse box to the alternator connector (the 2 or 3 line one) with clip on leads jiggle the line around, while testing it and see if the reading changes.
 

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I guess I should have elaborated a bit....

The ONLY thing that the battery indicator light is HOOKED to is the voltage regulator. Anything that has an effect on the regulator can cause the light to flash, flicker, etc.
 

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Did some guy at Autozone test it. He didn't even know what the machine was last week. And he is making less money than the guy that makes your frys at McDonalds. He would also probably sell you some spark plugs for your truck if you asked him to.
 

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Did some guy at Autozone test it. He didn't even know what the machine was last week. And he is making less money than the guy that makes your frys at McDonalds. He would also probably sell you some spark plugs for your truck if you asked him to.
Thats funny as hell
 

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The ONLY thing that will turn on the battery light is the voltage regulator ON the alternator (unless you have an 02-03 truck-not listed).

The regulator can still work fine....but the control circuit for the bulb can have problems.
I have an 02 truck
 

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Thanks Arisley, PHPDIESEL and EFFREEM for all the info on trying to figure this thing out Im going to try to get it done this weekend hopefully I will figure it out
 

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Good luck dude!

PHP, sorry didnt mean to imply you were incorrect or anything, just wanted to add a list some of the problematic areas of that circuit to what you were saying.
 

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Have a look at the single blade plug on top of alternator. Should have only one wire goin into the plug. Carefully unplug it and clean the blade connector inside the alternator. Now with a pair of needle nose pliers carefully squeeze the female plug so it connects snuggly onto the blade. No uncommon for this connection to become loose...I have also put a wheee touch of dialectric grease on connection.

let us know how you make out..

jrc
 
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