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I have just been fitting a roll bar to my Plus 4 supersport and when I came to start the engine, it would not fire, (although turning over ok) and a number of electrical gremlins appeared, eg no rear lights, brake lights, indicators, horn etc. I think I may have drilled through some wiring when locating the roll hoop on the cill boards. Is this possible, as the roll hoop base plates are pre-drilled, and I was only drilling through these holes, so I would have thought this would have been allowed for when designed. It is the Safety Devices model with the twin cross braces. I dont think it was a coincidence that it happened as the car was running fine last week. I think a number of fuses have blown, but a) there are so many fuses under the dash in front of the heater box I am not sure which is which as no diagram came with the car and b) I don't want to start a fire!

I think, my best option is to leave well alone and get it trailered to my nearest dealer. Any thoughts would be appreciated!

I bet you've knocked the fuel pump out too, that's why it won't start. Have you pinched part of the loom? Does this mean you're coming racing? Good luck.

I think you may be right!
Hopefully next season........................

Does anyone has a fuse card diagram for this model? In the handbook it states that a card was issued with the car, but I have never seen one. On the GoMog sight, there is a diagram of Plus 4 of 2004 onwards, but I think more fuses were subsequently added.
My car has been trailered off to a Dealer, but it seems likely that the wiring was "compromised" where it passes down Drivers side of the car.