BMW 318i boot locked can’t get into

[Greydog]

Morning Donald

We are a BMW Forum but having personally owned and run 3 AMG Mercedes under the Bonnet (Hood) on the left of the car (Drivers side for you) Mercedes put a plastic capped Pos terminal the Neg terminal was on the suspension mount. Same arrangement on a friends 2004 230 CLK

If you got burning it could be one of your connections was in the wrong place or just dirty. Hope it didn't melt anything

Dave

[X5smw]

Hi Donny. There should be a red + under the hood. On the wheelarch side fender will be a large nut. This is the - where the black lead goes. 
then use a charger so another battery to put power into the car and open the boot/tailgate that way. 

[DDONNY]

I tried hooking up my charger but got just a pop! The charger didn't make the pop, so I guess something in the car made the pop. I tested several fuses, for a blow out but saw nothing.  I will put in a new battery for the fob. If that doesn't work, I will look for the red battery cable under the rear seat and cut the wire; hook it to a good battery and see if that will work. 

[DDONNY]

To top that, I was looking for a tool to pull fuses and opened up the fuse cover in my '92 BMW E36 five-speed; and found out why I had been smelling burning plastic for a couple of weeks. The car was running just fine but found out that I had a small fire in the fuse box. The heater fan motor must have locked up. UGLEY! Something more to work on.

[DDONNY]

Re: dead battery keeps trunk or boot from opening. OK. I stumbled upon (in my brain), that you have to push the black surround keyway about a half an inch in, while the emergency key goes in. Amazing! Too bad it won't work for a 2011 BMW. re: 2003 Mercedes CLK430.

[DDONNY]

Now I just have to put in a good battery and figure what, and where, went POP.