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Old 09-13-2020, 09:48 PM #1
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Battery Light

Haven't been driving my truck much lately but last week when i started it battery light came on. Had tools with and headed to parts store thinking original alternator finally giving out and could die at any moment.

Tested voltage- 12.6 across terminals, charging at 14.7 skipped the purchase and drove home 3 hours, got home and load tested and it's fine started perfect all week just not sure why battery light is on?

Last edited by wrpsuite; 09-13-2020 at 10:12 PM.
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Old 09-14-2020, 08:32 AM #2
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Possible dirty terminals.

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Old 09-14-2020, 08:31 PM #3
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Will start there and see what happens thanks


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Old 09-14-2020, 10:44 PM #4
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Quote:
Originally Posted by brillo_76 View Post
Possible dirty terminals.

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I like how you think Brillo.
So many times we look past the more obvious and move on to the more complicated or expensive potential sources for the problem......iím guilty of the same!
Best to start by eliminating the more basic and cheap ones first.
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Old 09-15-2020, 09:50 AM #5
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brillo's fix first.

another reason the battery light comes on is an LED swap. i just had to revert to incandescent on mine for that indicator.
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Old 09-15-2020, 09:59 AM #6
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Battery post cleaner and terminal remover should be in everyoneís toolbox.


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Old 09-15-2020, 05:11 PM #7
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As old as these rigs are now. The chances of terminal and connections at the battery post being severely oxidized and those causing major resistance and bad conduction.
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Old 09-19-2020, 10:13 PM #8
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Cleaned battery, replaced terminals, checked ground wire, checked wires going to alternator and light still on. Making me crazy and worried to get stranded. May have to take alternator out and have bench tested.


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Old 09-19-2020, 10:26 PM #9
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Cleaned battery, replaced terminals, checked ground wire, checked wires going to alternator and light still on. Making me crazy and worried to get stranded. May have to take alternator out and have bench tested.


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Hit your Alt with a hammer. If the light goes out either replace the brush assemble or get another alternator.


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Old 09-20-2020, 09:24 AM #10
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Mostly the battery light comes on when the vehicle isn't charging. That's when mine came on.


So your getting 14.7 volts across the terminals when the engine is running is this at idle? As the these mostly dont charge much at idle.

Maybe your voltage regulator is failing and your voltage is going too high thus why your light is on.




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Old 09-20-2020, 02:29 PM #11
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12.7 when off
Drops to 11.5 when cranking
14.3 at idle
Smacked alternator battery light still on scratching head.


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Old 09-20-2020, 02:39 PM #12
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Take it to a local auto parts store (NAPA if you have one) and have them load test it.

It seems to be charging, but possibly overcharging the battery.
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Old 09-20-2020, 03:37 PM #13
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Had it load tested when first came on not the problem but thanks


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Old 09-20-2020, 04:03 PM #14
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Battery Light

Quote:
Originally Posted by wrpsuite View Post
12.7 when off
Drops to 11.5 when cranking
14.3 at idle
Smacked alternator battery light still on scratching head.


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What bulb do you have in for the battery light?

If you have an LED in it, it wonít work. The lamp is part of the circuit.

14.3 at the battery is good.


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Last edited by 19963.4lsr5; 09-20-2020 at 04:06 PM.
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Old 09-20-2020, 04:41 PM #15
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Stock light


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