Help!! Battery Light. - Ranger-Forums - The Ultimate Ford Ranger Resource


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  #1  
Old 07-23-2008
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Help!! Battery Light.

Battery light on cluster is coming on and staying on... Seems like there's a slight difference in the start of my truck?? I'm not sure where to start to look for problems.
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Old 07-23-2008
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Well I would first check your battery cables and make sure they are tight. Then make sure they are not dirty and in need of a cleaning.

Batteries go bad after awhile. It might be time for a new one.
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Old 07-23-2008
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those are some mighty sweet bed rails...im just sayin haha

+2 on the new battery

i know you said you were going to the auto tech school in mooresville...if your there i would do the usual checks on the alternator, starter, and battery...otherwise take it to advanced i suppose.

I had this happen on my old bonneville and it turned out to be that the starter was dieing on me and that meant dieing starter=dieing alternator=dieing battery...so hope your luck isnt as bad as mine was! haha
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Old 07-24-2008
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make sure the alt belt is tight. it could be a simple thing like that. your alt isn't charging your battery and therefore, battery isn't starting truck.

also look at the connections to the battery like jake said.

eliminate the small things before you start replacing major components like a battery
($100+) or alt. (whatever they cost).
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Old 07-24-2008
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Unplug the battery while the truck is running. Does it die? Then it's is your alternator. Also check fuses.
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Old 07-24-2008
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Quote:
Originally Posted by fddriver02 View Post
Unplug the battery while the truck is running. Does it die? Then it's is your alternator. Also check fuses.

it should die, there is no power. unless you mean there is a delay from the alternator's "supplied power"?

so if it stays running for a few seconds, it's not the alt? if it dies right away, it's the alt?

that correct? it's at least what i interprited your post described.
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  #7  
Old 07-24-2008
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Got a voltmeter?

Check Battery voltage, s/b ~12.x volts.

Start the engine, voltage s/b 13.8 - 14.3 volts.

If not, bad alternator. Keep driving it and the battery is gonna die.

Could also be a bad cable but probably alternator, especially if you have over 100,000 miles on it. Brushes wear out about then, give or take 30k.
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Old 07-25-2008
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All the electrical junk cut off yesterday on the way to work and when I pulled in the shop and shut the truck off it wouldn't crank back up.. Tested the battery, it was fine. Put a new alternator in and Problem solved. ;-)
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Old 07-25-2008
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Quote:
Originally Posted by fddriver02 View Post
Unplug the battery while the truck is running. Does it die? Then it's is your alternator. Also check fuses.

WOOOH!! Don't ever disconnect the battery while the engine is running! The Di/Dt can create huge voltage spikes, which can destroy expensive electronic components like the PCM, GEM, etc. ...

Simple voltage measurements can tell you if the alternator is working properly.
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Old 07-25-2008
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Quote:
Originally Posted by Takeda View Post
WOOOH!! Don't ever disconnect the battery while the engine is running! The Di/Dt can create huge voltage spikes, which can destroy expensive electronic components like the PCM, GEM, etc. ...

Simple voltage measurements can tell you if the alternator is working properly.
x2 Not to mention it can ruin your alternator.
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  #11  
Old 07-25-2008
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go to auto zone and they will do a load test on it and help solve the problem
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Old 07-25-2008
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Same thing happened to me.

Whenever your battery light is on, when your truck is running...it's most likely your ALT, not your battery.
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Old 08-23-2008
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your alternator is shot. same thing happened to me.
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