Tail Light Fuse Blows when Engine Starts

[hotoval1]

Hi Hoping someone can assist!

After sorting out my lights and getting them all working with the ignition switched on I was a bit surprised when the tail light fuse blew when I started the engine.


Replaced the fuse and it did it again. It is a 1970 LHD Microbus and the wiring is not original!


Any thoughts gratefully received?

 

[Bluesnailman]

Sorry ,my only thought is 'thats very odd, how can that happen'. What else relies (on your non standard loom) on the same fuse?