Hi:
I owne a Volvo V70 2.5ft 2009 (200hp).
I have several problems.
My centrallock does not work, started today. The car belives it is locked but its not. When i try to lock the car with a open hood there is a sound form the engine
In neutral with a hot engine the RPM is at 700. and the car seem to fight to stay alive, also seem to shake more then it used to.

Sometimes, more often then not: when i start the car, then the engine start but none of the internal electical stuff start. So i see no RPM, no speed dial, the central monitor where the radio chanels show does not light up, no indicators show either.
When this happen and i view the car from the outside, then all the lights work.

Whats can be the problem?

 

you'd need to trace circuits via a wiring diagram, but for a quick start, I'd look for common ground points and check the cables / ground strap to the battery. Try cleaning the battery terminals as well.