Problem with Peugeot Partner 2.0 HDI 90CV of 2001

Good afternoon everyone, to see if you can help me with the following problem.
I have a Peugeot Partner 2.0 HDI of 2001. Suddenly the engine stops. After several tests I check that if I take the contact key and put back it starts. I go to the workshop and tell me after putting the diagnostic machine that has the switchboard badly. I get out of the workshop and every time I stop in Semaforo stops, also when I stop accelerating. I locate the switchboard, they encode it and now it stops every 4 or 5 seconds. But if I start and accelerate, I do not stop. In the painting, the yellow indicator is entered that I think is a injection pump. Now they tell me that it is an electrical installation problem.
Can anyone help me? I think they are going to make me go around the van changing pieces and in the end it will look good, but at what price? I appreciate your consensus in advance. thank you.