Hi, my 156 had the dreaded dim tailight/faulty rev counter bulb warning problem, so I removed the rev counter to fix/replace it. Also the plan was to stop it draining the battery in the meantime.
After being left for a few days, and hearing what I now realise was the alarm going off (it's a new car - sorry neighbours!!) I came to it and it was completely flat, no dashlights, anything - other than the alarm siren which must be battery-backed it was completely dead.
Then the weird thing - after hooking up some jump leads, the whole thing leapt into life, and started easily immediately. They weren't good quality jump leads either, horrid puny things that I thought would struggle to carry any current at all.
So the engine started and ran perfectly well, so I removed the jump leads and the engine immediately cut out!
The dash lights went back to not existing and it wouldnt even considering turning over or even clicking. Soon as the jump leads were reapplied it roared into life again!
It was dark and I was p***ed off and short of time. Any suggestions? I realise it could be the battery, but why on earth would a crappo set of jump leads be able to instantly jump the car healthily yet as soon as they are removed it cuts out. Maybe a dodgy earth or something. It's making my head hurt!