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  #1  
Old 02-08-2015, 04:23 AM
wilsonbh wilsonbh is offline
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Default Battery Light Stays On

First, my alternator reading on the dash guage went to "L" and the battery light turned on. OK, checked the battery and with the engine running, was getting 12.4V. No evidence of being charged by the alternator.

Replaced the alternator and then checked again. Got 14.6V. Success! Alternator was charging like it is supposed to do. But battery would not hold a charge.

Replaced the battery with a brand new battery. Now, the dash battery light will not go out. New alternator, new battery.....light persists.

Anyone have any suggestions?

Bill
wilsonbh@bellsouth.net
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  #2  
Old 02-08-2015, 02:23 PM
nelbur nelbur is offline
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Default Re: Battery Light Stays On

Actually 14.6 volts is high. I would consider 13.5 to 14 volts normal. I don't know if the light is on because of high voltage or not, but it seems possible.
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Old 02-08-2015, 09:43 PM
02RangerFX4 02RangerFX4 is offline
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Quote:
Originally Posted by wilsonbh View Post
First, my alternator reading on the dash guage went to "L" and the battery light turned on. OK, checked the battery and with the engine running, was getting 12.4V. No evidence of being charged by the alternator. Replaced the alternator and then checked again. Got 14.6V. Success! Alternator was charging like it is supposed to do. But battery would not hold a charge. Replaced the battery with a brand new battery. Now, the dash battery light will not go out. New alternator, new battery.....light persists. Anyone have any suggestions? Bill wilsonbh@bellsouth.net
What is the gauge reading?
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  #4  
Old 02-09-2015, 03:19 AM
wilsonbh wilsonbh is offline
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Default Re: Battery Light Stays On

UPDATE: With the engine off, the voltage reads 12.6v on the battery. With the engine running, it reads 14.6v so I assume the alternator is charging properly.

I replaced relay #14 in the power distribution box with no change. The battery light stays on. I can remove the battery connections, reinstall them and it still stays on.


Could this be a OBD thing that needs resetting? Anyone have any advice? Ignore it?

Bill
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  #5  
Old 02-09-2015, 07:18 AM
pk9298 pk9298 is offline
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Take it to an AutoParts store and have them hook the battery/alternator/starter tester to your truck and go through it. I don't think the battery light works with obdII. And if that doesn't work then call a mechanic.
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  #6  
Old 02-09-2015, 11:30 AM
riscorpian riscorpian is offline
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Default Re: Battery Light Stays On

Does it look like the light is half-illuminated instead of completely bright? Compare the light level to other dummy lights on the cluster. I actually have a very similar issue on mine, and I've read that the stupid dimmer switch can be the ultimate cause. It might just be a bizarro coincidence that it's sticking on right now.
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  #7  
Old 02-11-2015, 11:59 AM
rangersethr1996 rangersethr1996 is offline
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Mine stays on but really dimm because replaced the bulb with an led
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