Battery dead in my 97 E420, and can't get in... - Mercedes-Benz Forum
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post #1 of 54 (permalink) Old 03-14-2019, 04:13 PM Thread Starter
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Battery dead in my 97 E420, and can't get in...

Hi guys, so I didn't use my E420 this past winter and now the battery is dead. Is there an easy way to jump it from the undercarriage since I can't get in to open the hood?

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post #2 of 54 (permalink) Old 03-14-2019, 04:56 PM
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No. But don't you have the metal key? If not, then how do you start the car?

Anyway if you don't have the metal key, you can try to take off the plastic cover on the bottom of the engine and reach up to pull on the hood release cable. But I'm not sure how much room you would have with the E420.
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post #3 of 54 (permalink) Old 03-14-2019, 05:40 PM
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Would it be worth a try attaching a positive jumper cable to the heavy positive cable on the battery and of course ground the other one?

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post #4 of 54 (permalink) Old 03-14-2019, 05:45 PM
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Yeah you can do that.
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post #5 of 54 (permalink) Old 03-14-2019, 05:51 PM
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Actually you do not need a heavy jumper cable, if the purpose is to open the car doors so you can open the hood to charge the battery. For my other car, the battery is under the hood, close to the firewall. I had connected a fused cable that came with the battery maintainer which I extended to just under the passenger side wiper. The cable has a special connector and a protector cap. When I do not use the car. I put it on the maintainer. Even if I forget it and let the battery to discharge, I can connect the maintainer to charge the battery enough to open the doors.

I am thinking of doing that with the E320, using the charge posts under the hood at the driver's side. You can get fused cables with proper connectors to mate with the maintainer from Amazon or Ebay.
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post #6 of 54 (permalink) Old 03-14-2019, 06:32 PM Thread Starter
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No. But don't you have the metal key? If not, then how do you start the car?

Anyway if you don't have the metal key, you can try to take off the plastic cover on the bottom of the engine and reach up to pull on the hood release cable. But I'm not sure how much room you would have with the E420.
I do have the flip key, but I get no response from the car when I press the button, and I also get no response when insert and turn the key in trunk's keyhole. The keyhole in the front passenger door never worked, it just turns freely.
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Would it be worth a try attaching a positive jumper cable to the heavy positive cable on the battery and of course ground the other one?
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Actually you do not need a heavy jumper cable, if the purpose is to open the car doors so you can open the hood to charge the battery. For my other car, the battery is under the hood, close to the firewall. I had connected a fused cable that came with the battery maintainer which I extended to just under the passenger side wiper. The cable has a special connector and a protector cap. When I do not use the car. I put it on the maintainer. Even if I forget it and let the battery to discharge, I can connect the maintainer to charge the battery enough to open the doors.

I am thinking of doing that with the E320, using the charge posts under the hood at the driver's side. You can get fused cables with proper connectors to mate with the maintainer from Amazon or Ebay.
I bought a brand new Bosch battery just a few months ago in mid October. I drove it sparingly though because I had been working on it on and off with your help @mrboca and others in this forum. I just didn't think the battery would go flat this quickly...

So I'm locked out of the car, the battery is under the back seats, I can't open the hood. I was hoping there would be like a third positive terminal under the car somewhere, or a hack that you guys would know of.

Even if there was, I'm also not sure if I can jack the car up, it's on a slight incline in the driveway, parking brake not engaged. Maybe its safe to lift from one side and the help of a wheel chock?

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post #7 of 54 (permalink) Old 03-14-2019, 07:11 PM
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With key blade unlock the car from right door handle.

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post #8 of 54 (permalink) Old 03-14-2019, 07:15 PM Thread Starter
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With key blade unlock the car from right door handle.
That keyhole doesn't work at all. The key just turns freely. That's why I've used the trunk keyhole when flip key battery died, but now the actual car battery is the issue...

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post #9 of 54 (permalink) Old 03-14-2019, 07:22 PM
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That keyhole doesn't work at all. The key just turns freely. That's why I've used the trunk keyhole when flip key battery died, but now the actual car battery is the issue...

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Lift it up. Connect positive charger lead to large lug on the starter. Negative to any clean engine block part.
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post #10 of 54 (permalink) Old 03-14-2019, 07:42 PM
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Can you open the trunk with the key ?

Last edited by mrboca; 03-14-2019 at 07:51 PM.
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