Is it possible to apply an external power source from outside the vehicle?
Thread Starter
MBWorld Fanatic!
Joined: Jun 2002
Posts: 7,266
Likes: 170
From: So. Oregon Coast
C230 Sport Coup + 2006 W164 ML350 + 99 Ford Escort RIP
Is it possible to apply an external power source from outside the vehicle?
So, there's an ongoing issue where the emergency key does not work in this vehicle, (ie 2006 Ml350) and
anytime the battery gets discharged, there's no way to open the vehicle.
Yeah, I asked the mechanic about it but he just kinda shrugged his shoulders, didn't
seem interested in fixing it at least not without a pile of cash.
I was thinking is there a way to applying an external power source from outside the vehicle,
just enough juice to allow the key to open the door?
Such as through the mirror assembly (not sure how that comes apart, so I'd need that too)
or through the trailer electrical hookup?
The lights were not left on, but we've had lots of rain/water related problems lately, so
apparently something drained the battery, wasn't driven for about 48 hours. But 1st need to get in the car.
Tried prying open the edge of the door with plastic wedges but not enough.
This happened before, and AAA used an inflatable dookicky to push the door open enough to get a tool
in to unlock the door.
Any suggestions to getting some juice to the system?
I have a 12V jumpstarter, so just need an in to the electrical system.
It'll be interesting see how AAA takes to get here in our new(ish) home on the coast of Oregon.
They have a saying "No hurry in Curry" Curry being Curry county Oregon. .
EDIT: Well, they showed up pronto, and used one of these...
https://www.jbtools.com/access-tools...hoC27sQAvD_BwE
Guess I need to invest in one.
Battery is charging.
anytime the battery gets discharged, there's no way to open the vehicle.
Yeah, I asked the mechanic about it but he just kinda shrugged his shoulders, didn't
seem interested in fixing it at least not without a pile of cash.
I was thinking is there a way to applying an external power source from outside the vehicle,
just enough juice to allow the key to open the door?
Such as through the mirror assembly (not sure how that comes apart, so I'd need that too)
or through the trailer electrical hookup?
The lights were not left on, but we've had lots of rain/water related problems lately, so
apparently something drained the battery, wasn't driven for about 48 hours. But 1st need to get in the car.
Tried prying open the edge of the door with plastic wedges but not enough.
This happened before, and AAA used an inflatable dookicky to push the door open enough to get a tool
in to unlock the door.
Any suggestions to getting some juice to the system?
I have a 12V jumpstarter, so just need an in to the electrical system.
It'll be interesting see how AAA takes to get here in our new(ish) home on the coast of Oregon.
They have a saying "No hurry in Curry" Curry being Curry county Oregon. .
EDIT: Well, they showed up pronto, and used one of these...
https://www.jbtools.com/access-tools...hoC27sQAvD_BwE
Guess I need to invest in one.
Battery is charging.
Last edited by C230 Sport Coup; Mar 28, 2022 at 10:22 PM.
MBWorld Fanatic!
Joined: Jun 2014
Posts: 1,086
Likes: 443
From: Melbourne, Australia
2010 ML550 VIN WDC1641722A564750, 2010 B180
If you're locked out and the battery is flat, and the key doesn't work, you can remove the plastic cover under the engine bay and then with a spare battery and jumper leads, reach up and apply 12v to the rear terminals of the alternator. That will give you more than enough power to unlock the doors assuming your fob works. Just make sure you know where to earth it and connect to the right terminal.
Last edited by BlackML550; Mar 29, 2022 at 07:04 AM.
MBWorld Fanatic!
Joined: Jul 2012
Posts: 4,515
Likes: 1,514
From: Orbiting the planet
This place is a joke.
This sounds like a ridiculous idea. You either have the wrong key blade or you're using it wrong. If it turns in the glovebox and rear hatch then it should work in the door, unless the door was replaced with a used part, if the car was in an accident. Is the key blade turning in the driver's door handle? If so, hold it turned and pull the door handle quickly and repeatedly a few times and it should open. If not, you can open the rear hatch with the blade. If you have the wrong blade get the correct one from the dealer. They aren't expensive.
