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Old 08-17-2013, 06:56 PM   #1
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Solid red battery light on dash?

2009 JK X

Alrighty, here's the skinny... (I did a search, but everything that I've seen isn't really relevant to my situation)

2-3 months ago, did some heavy winching with some buddies that were stuck in some sand at the lake, probably 3-3.5 hours worth. Everything has been fine until recently.

A couple days ago, I get in the Jeep, and it's dead. Makes a single click when I turn the key, and all the lights are dim. Okay, battery is shot. No biggie, it's the stock Chrysler battery and it's 4.5 years old now, so it's probably due.

Today I replaced the battery with a DieHard Platinum, Jeep fired right up, everything is working, but I have this solid red battery light on the dash. I thought it was possible the battery was a little low, so I drove up and down the highway for about 15 minutes, and the light is still there.

Have any of you guys seen this before or have an idea what it could mean?

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Old 08-17-2013, 07:33 PM   #2
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Sorry, let me add:

When I initially got in the Jeep and it was dead, I jumped it and drove it, came home and it started up again. The next morning, it was dead again. I jumped it, drove it around and got the same thing. Both times when I was driving around, this light wasn't on.

I understand that it's representing something going on with the charging system, but it's strange that it only came on after putting a new battery in.

Thx!

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Old 08-17-2013, 08:12 PM   #3
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Did you check your alternator, what is your charging voltage should be about 14.5 volts.
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Old 08-17-2013, 08:42 PM   #4
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Quote:
Originally Posted by socalrider View Post
Did you check your alternator, what is your charging voltage should be about 14.5 volts.
Yeah, I guess it would make sense to check that 1st. When it comes to general mechanical repair, I'm fairly handy. Electrical is a different story, so I'm not sure if I did this right.

The battery is at 12.62v, when I start the engine, I have 12.3v at the battery cables, when I shut it off I have 12.5v.

I'm not sure how to test the alternator with the engine running, so is what I did accurate?
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Old 08-17-2013, 09:13 PM   #5
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Yes, and your alternator is NOT charging your battery. The charge at the battery with the engine off should be approx. 12.5 volts or higher. With the engine running it should be anywhere from 13 to 14.5 volts depending on the current state of charge of your battery. (voltage regulator varies the voltage supplied to the battery)

Your voltage went down when the engine was running because your jeep is running off the battery without any help from the alternator.
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Old 08-17-2013, 09:22 PM   #6
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Originally Posted by jmb6420 View Post
Yes, and your alternator is NOT charging your battery. The charge at the battery with the engine off should be approx. 12.5 volts or higher. With the engine running it should be anywhere from 13 to 14.5 volts depending on the current state of charge of your battery. (voltage regulator varies the voltage supplied to the battery)

Your voltage went down when the engine was running because your jeep is running off the battery without any help from the alternator.
Great, thank you. I believe we've cornered this thing. At least now I have an excuse to get a Mean Green.

Thank you, I appreciate your time and advice!

*edit - scratch that. I think the stock alternator is probably stout enough. Either way, out with the old, in with the new.
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Old 08-18-2013, 03:16 AM   #7
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DunDunDun Alternator...


Quote:
Originally Posted by Flyin Crispy View Post
2009 JK X

Alrighty, here's the skinny... (I did a search, but everything that I've seen isn't really relevant to my situation)

2-3 months ago, did some heavy winching with some buddies that were stuck in some sand at the lake, probably 3-3.5 hours worth. Everything has been fine until recently.

A couple days ago, I get in the Jeep, and it's dead. Makes a single click when I turn the key, and all the lights are dim. Okay, battery is shot. No biggie, it's the stock Chrysler battery and it's 4.5 years old now, so it's probably due.

Today I replaced the battery with a DieHard Platinum, Jeep fired right up, everything is working, but I have this solid red battery light on the dash. I thought it was possible the battery was a little low, so I drove up and down the highway for about 15 minutes, and the light is still there.

Have any of you guys seen this before or have an idea what it could mean?
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Old 08-18-2013, 11:12 AM   #8
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Originally Posted by insylem View Post
DunDunDun Alternator...

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