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Old 07-09-2012, 10:18 AM   #1 (permalink)
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Dead Battery - HELP!

We were out of town for the weekend so my 300c sat in the garage for 3 days. This morning when leaving for work I went to start it and it was completely dead. The dash lights flickered, but nothing else would happen. We hooked up some jumper cables and let it sit for 5-10 minutes, and while the dash lights were solid and not flickering it still wouldn't start. I took the key out of the FOB because the manual said the key could be removed for an emergency manual start. Great! But, I can't anywhere to insert the key into the ignition. Anyone else successfully manually start their 300? I'm also concerned its not a battery problem since the car just sat in the garage all weekend. Thanks in advance for any tips.
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Old 07-09-2012, 12:26 PM   #2 (permalink)
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Two things might be the culprit here:

1. A bad battery

2. A bad main power connection.

So, check your connections + & - connections at the battery, starter and the aux post under the hood. If they are clean and tight, then pull the battery and have it tested.
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Old 07-09-2012, 01:31 PM   #3 (permalink)
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on a second attempt I was able to get the car going. Maybe I didn't have a great connection with the jumper cables the first time? I also called Chrysler to ask about the emergency key and where it would be used if I had to use it to start the car like the manual says. They had no answer. So, I guess that key is only for the doors and glovebox. I also found out that the trunk release would not work when the battery died, and I tried both the one in the car and on the rear deck. Hopefully the car starts up again after work. If not, I'll be taking it to the dealer to be checked out.
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Old 07-09-2012, 02:29 PM   #4 (permalink)
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I had a dead one and was a bit stumped, at first, on how to jump it because the trunk would not open (dead battery, no power, no lock) until I figured out all I needed to do was put the jumper on the front aux post and a good ground to jump it or at least get enough power for the trunk button.

I couldn't go through the backseat to get at the emergency release as the sub box is too big.
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Old 07-09-2012, 07:59 PM   #5 (permalink)
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Exclamation Preparations for Jump Start

On page 419 of the owner's manual, it specifically says to use the remote positive and negative posts in the front engine compartment on the right side, NOT the actual battery in the trunk.

To be clear, this means on the LEFT side of the engine area looking under the hood from the front bumper. The positive terminal is covered with a red cap, and the negative terminal is a plain post sticking up and attached to the car's frame. These contacts are on either side of the black fuse box. There are raised graphics on the lid of the fuse box pointing out the connectors.

The connection order is:
1. Connect jumper cable to discharged vehicle's + post (under red cap on new Chrysler 300).
2. Connect other end of + cable to booster battery's + post.
3. Connect - cable to booster battery's - post.
4. Connect other end of - cable to the remote - negative post just behind the fuse box in discharged 300's engine compartment.

Then, start the engine of the vehicle with the booster battery, let idle a few minutes, then start the car with the dead battery.

Once it's running, disconnect the cables in the reverse order above, and proceed to the shop to replace the dead battery.

Extra credit: on page 12 of the manual it addresses a dead battery in the key fob. After using the manual key to get in the car, just press the black end of the fob against the Start/Stop button to start the car.

Last edited by Dave Marsh; 07-09-2012 at 08:28 PM.
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Old 07-09-2012, 08:15 PM   #6 (permalink)
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Was the key fob left in the garage near the car for the weekend ? The RF module could have been sensing the key, illuminating the dash and powering the entry system, and subsequently drained the battery.
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Old 07-12-2012, 04:58 AM   #7 (permalink)
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I had this problem too a while back in the Charger. The biggest cause was probably the negative terminal on the battery, although it was tightened all the way it did fully clamp onto the post. I also suspect the keyless go system also played a part but that shouldn't be happening now with all the fixes.
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Old 03-25-2013, 01:27 AM   #8 (permalink)
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Quote:
Originally Posted by fm1 View Post
Was the key fob left in the garage near the car for the weekend ? The RF module could have been sensing the key, illuminating the dash and powering the entry system, and subsequently drained the battery.
Resurrecting this because I just had this exact same problem. Left the key in the car in the garage for two days ... dead battery.

Last edited by z3ro; 03-25-2013 at 01:27 AM.
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Old 03-25-2013, 03:32 PM   #9 (permalink)
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Must be something in the water. I have 3 batteries and guess what...
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Old 03-25-2013, 03:41 PM   #10 (permalink)
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Re: Dead Battery - HELP!

Mine was dead this morning too lol.

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