Honda civic 1.5 sli Auto. 1990.
Generally brilliant car - 100,000 miles and regularly serviced.

A week after las service I was travelling on a motorway at around 70
mph on a clear day.
Flicked the indicator switch to turn left and heard a pop sound -
seemed to be infront of me but am not sure if  it was in the car or
under the bonnet.
Anyway, then effectively the ignition totally failed - all dials wnet
to 'zero' and all power stopped, althogh I was able to put on hazard
lights.
Managed to pull over an dcall breakdown people. However after about 10
minutes it started OK and was fine.
The Breakdown people could not find a fault. It went into the garage
next day and they could not find a fault. All fuses and wiring appears
100% ok.

Anyone have any ideas?

Is there any switch to turn everything off in an accident (to prevent
fire) or something similar.

Car has been beuatifully OK ever since but I would like to trak down
the fault as it presented a dangerous situation for me and others.

Thanks