Flat Battery, can't open vehicle

[Tony Dyson]

The ARTECK D-29 900A Peak Car Jump Starter is a Jump Starter NOT a Smart Charger and is likely outputting voltages in excess of 12v.
I have been attempting to find an OM for the product but am unable so far! there is an On/Off switch on the rear that you could use though?

 

[LostKiwi]

So to reiterate...
+12v (red clip) on terminal 5.
Black clip to clean metal on engine.
Push button and nothing happens?

If correct put red to terminal 4 or 6. You should definitely get something happen then. That will prove connections and booster.

 

[Tony Dyson]

I know I keep asking the same question, but thought I'd try again: can anyone advise where the cable from the bonnet release runs through the engine compartment. I feel that this is my best option, to find this and pull it. Thanks

https://mercedes.7zap.com/en/eu/fg/car/ input your VIN here and you will have access to the schematics of your vehicle.

 

[M80]

I know I keep asking the same question, but thought I'd try again: can anyone advise where the cable from the bonnet release runs through the engine compartment. I feel that this is my best option, to find this and pull it. Thanks

On ine it runs from centre, the locking mechanism,
along the top, just below the bonnet when closed, to the nearside.
Heading back toward the bulkhead (the release handle) before the headlight.


As I said a while back some chargers will require a residual voltage of perhaps 10volts to initiate.
If your neighbours battery was just low it may have been enough to initiate the charger.
I would have thought if it has the maintenance, permanent output function there would be an option in the menu. But I haven't read or am familiar with yours.

Yep splashing the ends will demonstrate the charger has output. I do it to prove this rather than connecting up and finding I forgot to switch the socket come morning time.

Edit: On saying that I've 2 Aldi clever chargers and both indication when powered up and a voltage readout of the battery when connected.
But they will not charge a deep discharge battery, they fail to initiate the charge cycle.

 

[tommymac]

Ok. Six days in, and the first sign of progress.

Searching re the hood release mechanism, I found this:

Although the emergency access routes are not there on my model, it gave me a clue re where I needed to be looking.

Within seconds I had popped the passenger side.

 

[tommymac]

Passenger side

 

[davidsl500]

To be honest I can’t feel anything. I can barely get my finger there. Do we still go for this, or are there second thoughts creeping in?

I’ve gone the coward’s way, and attached a wire!

Where's the other end of that wire going? - I can see the croc clip on the terminal but the wire looks weird and seems to be going further up into the engine

 

[tommymac]

Struggling to find same in the driver’s side. Not sure if it’s buried under this cover somewhere.

 

[LostKiwi]

I know I keep asking the same question, but thought I'd try again: can anyone advise where the cable from the bonnet release runs through the engine compartment. I feel that this is my best option, to find this and pull it. Thanks

It runs alongside the inner arch at the top where the wing bolts on. It then Runs behind the headlight and into the drivers side latch before going under the slam panel to the passenger side latch.

 

[tommymac]

It runs alongside the inner arch at the top where the wing bolts on. It then Runs behind the headlight and into the drivers side latch before going under the slam panel to the passenger side latch.

ok, thanks lost kiwi. If I can't find the release catch from underneath, as I did with the passenger side, then it sounds like I can get access to the cable by removing the front o/s wheel, and the guards that sit behind it?

 

[LostKiwi]

ok, thanks lost kiwi. If I can't find the release catch from underneath, as I did with the passenger side, then it sounds like I can get access to the cable by removing the front o/s wheel, and the guards that sit behind it?

Only if you can get through metal....
The cable sits in the engine bay running along the top of the inner guard.

 

[tommymac]

Only if you can get through metal....
The cable sits in the engine bay running along the top of the inner guard.

ok, understood, then that rules that option out. Perhaps I can find it behind the headlights...

 

[davidsl500]

I'm pretty sure that the battery booster is the root of the problem and a normal mains battery charger would sort it instantly - or a jump lead from another car battery.

 

[M80]

This may well come up again.
Do you chaps think a 12v alarm battery would have enough energy to pop the locks?
Cheaper than a car battery, more portable, and less scary splashes for those that might find shaorting leads (by accident) scary.

 

[tommymac]

Better pictures attached

1. the passenger side release that I popped

2. what I believe to be the driver side release, which has a cover on it. Interesting to see that there is a disconnected lead here, presumably some sort of sensor.

part of me just says get in under the cover of the driver release, however possible, and pop it. Will do a bit more googling first though, and maybe even a walk down to the local Mercedes place, to see what they might be able to tell me.

If anyone else has a similar mechanism, and can offer any advice on how to pop it, this would be appreciated.

 

[Tony Dyson]

And when the alarm battery discharges he's going to need a battery charger to recharge it!

Everybody has a battery charger in their armoury don't they? you can't keep using a jump starter to recharge 80-100Ah batteries especially ones that have been subject to deep discharge cycles.

Taking a step back I agree with @davidsl500 and think the Jump Starter isn't the appropriate instrument to use for a 12vdc power supply, when the bonnet is popped the OP will have a deep discharged battery to deal with and the only home tool to deal will that will be a genuine Smart Charger or an Auto Electrician with the appropriate tools, so the OP should decide what best fits his plans?

Currently pulling cables to pop the bonnet, failing this, I suggest enlist the neighbour's assistance and using jump leads from his car connect the +ve to the screwdriver, locate Term 5 and connect with a firm push, then your neighbour with -ve clamp in one hand keyfob in the other connects the clamp to an appropriate -ve reference where a good connection should be evidenced by a weak spark, keep pressing unlock until car opens.

Open the bonnet, connect jump leads from neighbour's car or your jump starter to Jump start terminals on your car, start engine, go for a long run, then at your leisure, research car battery chargers and buy one for your toolbox.

 

[tommymac]

And when the alarm battery discharges he's going to need a battery charger to recharge it!

Everybody has a battery charger in their armoury don't they? you can't keep using a jump starter to recharge 80-100Ah batteries especially ones that have been subject to deep discharge cycles.

alarm battery? that’s the first time this has been dropped into the conversation. Please can you elaborate

 

[tommymac]

The ARTECK D-29 900A Peak Car Jump Starter is a Jump Starter NOT a Smart Charger and is likely outputting voltages in excess of 12v.
I have been attempting to find an OM for the product but am unable so far! there is an On/Off switch on the rear that you could use though?

Instructions for Arteck D29

 

[Tony Dyson]

Well the good news is that it states an output of only 12v so this isn't likely to damage your car's electronics at all, the alarm battery was suggested as an alternative to your Jump Starter and I've suggested a way forward in post 156.

How did you get on with finding the OS Bonnet release cable?

 

[Tony Dyson]

When you first turn on your Jump Starter, what is the reading displayed on the LCD Screen?