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Dead battery in boot-cant open boot...

Vampirenick

New Member
Joined
Aug 19, 2019
Messages
6
Location
Hertfordshire
Car
Mercedes c180
Hi, can anybody help...I have an old 1998 c180 automatic and the battery is completely dead, I cannot get into the boot where the battery is because the boot release switch inside the car doesn't work, it is a saloon so no access into the boot, I don't think anyone has used the actual boot key lock in years, including me, so when I went to use it, it won't open...I have used lubricants in the lock, which did get the key in most of the way, but I think it should go in a bit more, but won't, so it won't turn, therefore I cannot get into the boot to charge the battery...is there another way to get some power into the system if only to pop the boot release switch? I have seen a jump system that plugs into the cigarette lighter socket of another car and the dead car to get power instead of traditional jump cables, but they say you have to turn the ignition key to the accessory position on the ignition barrel, well mine isn't a traditional key, it's one of those silly integrated fob key things with a pull out bit of key for the doors for when the fob won't open the central locking, anyway, as I can't turn it in the barrel, that won't work. Is there any other way I can get my boot open other than having to smash the lock out? Thanks in advance...
 
Are there jump points in the engine bay?
 
THE MAIN FEED WIRE [ USUALLY RED] TO THE STARTER SOLENOID IS A DIRECT LINE FROM THE BATTERY= ALWAYS LIVE Stick a +12 volts supply on it and 0 volts to a good vehicle earth point and you should have enough power* to operate the boot release

* BUT NOT TO START THE CAR OBVIOUSLY
 
IIRC one of TV's little tricks with a reluctant emergency key, after copius application of WD40 or similar into the lock, was to put an electric toothbrush against the key in the lock, the vibration helps release the reluctant bits!

Also pop the bonnet and look for a red plastic cover over an emergency +ve connection, on my S203 it was NS near the bulkhead. If you have that, +ve jump lead to it and -ve to the top of the suspension!
 
I had the same problem with an R129, which had a fuse box in the engine bay. If you removed the fuse box cover and connected a battery charger + to one of the permanent live fuses, and the negative to earth, you could get enough power to release the boot that way.
 
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