Tailgate Ford Focus Cmax Mk 2

[Broadway]

Hi

So I have this very frustrating issue where my boot lid (tailgate) will not open. I have a Focus CMAX 06 plate. So far :

1: Changed Solenoid latch

2: Chamnged switch on boot lid

3: Renewed battery in FOB

Symptons

Boot either works or doesnt work on key fob either full unlock or bootrelease, when checking the new unit it has 4 pins on the solenoid where as the old one had 5. But as a say it works for a few days, then stops... I never do anything to make it work like disconnecting battery etc I just wake up in the morning and it works then by the time I get to my journeys end it stops working..

I am really pulling my hair out here the one thing I would state including the 4 pins versus 5 pins is that it reads 10V on the first pin on the right permantley.. NOT 12 volts where is that supply coming from ???????