Rear light cluster issue.

[Pompey306mark]

Right passanger side rear cluster is driving me crazy.

Drivers side is all fine, basically the running lights don't work.
Reverse fine,
Brake fine,
Indicator fine,
Fog fine.

I have swapped the bulbs from one side to the other no issues with bulbs.
I have also noticed the number plate bulbs aren't working.

So far I have re wired the number plate lights, changed the connector for the number lights, which plugs into rear light connector.

Any ideas? Could it be a fuse? If so which one save me checking them all.
Lights have been earthed in the past.

[spike2002]

Have you checked to make sure the earth is good? And checked for corosion on the board the bulbs go in to?

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Also check the plug that runs off the drivers side light to the pas side

[Pompey306mark]

No board. Sorry should have said phase 1 lights.

Earth has always worked before.

[spike2002]

There is a board on phase 1 lights that the bulbs go in to its plastic with metal runing around it. It pops off the light unit so you can change the bulbs mine was badly corroded

[Matt]

I'd take the earth off give it a bloody good sand down on both surfaces an give it another try