Motor not start - glow relay regulator???

Hello.

I have problem with start of motor. 2.0 Diesel 120kw

I have no error on OBD and the engine when is cold not start after 15 second full turning of engine (when start come white smoke)

When i connect the voltage +12V direct to glow plugs for 2 seconds engine start immediately.

I have checked:

- Acu - ok (very fast turning the engine)

- glow plugs - ok ( I check them with ohm meter and with 12V on - touch with 12V on each cable and current go

I have questions about my glow regulator ....

I have this regulator: https://vauxcentre.co.uk/produ…w-plug-relay-55574293-new

4 poles connector wires go to glow plugs - I checked them, all wires and connector OK

5 poles connector

- center pin 12V OK

- 4 pins around

1. Black ground OK

2...