Technical Speedo not working also fuse F11keeps blowing

[Wopsywal]

Have checked the wires no brakes that I can see. disconnected all the wiring connections alls fine till I plug the Inertia switch back in then the fuel blows
Runs just fine.plus the speedometer working that's how I found the blown fues

 

[Communicator]

Your headline is typical of a failed oil vapour heater. However the text of your post seems to be confused. There is no direct connection between the inertia switch, which is located on the bulkhead near the rear end of the battery, and F11 which is designated as EI (Electronic Injection) secondary services. The inertia switch cuts off the in tank fuel lift pump in the event of a collision, are you confusing it with the oil vapour heater, which in all but extreme UK weather conditions may be left unplugged as a temporary fix.

 

[Wopsywal]

Thanks for the help you where spot on the connection was full of water unplugged the connection and no fuse blown thank you