Tail light problem K75S 1990

[kjel-man]

Hello!
I have a strange problem with the taillight on my 1990 K75S (ABS). When I put the ignition switch to parking light, both the backlight and front bulb light up as it should. When I put the ignition switch in the start position, both bulbs turn off.
Does anyone have an idea what this error might be?
Kjell

[Inge K.]

Welcome Kjell!

If your cluster light shows when ignition on, the problem is in the ignition switch.
If the cluster light doesn`t show, the problem is in the light on/p/off switch.

Ignition switch dismantling.

Inge K.

[kjel-man]

Thank you Inge K! 
The ignition switch is brand new. The cluster light do not shows, so it must be the light on/p/off switch.
Kjell

[Inge K.]

RHS switch assy dismantling.

The problem could also be in the switch assy connector under the tank,
the grey/blue wire is the park/tail/cluster feed, measure at both sides of the connector.

Inge K.

[kjel-man]

Problem fixed!
Thank you Inge K
Kjell