95 xj6 i bought a computer for lights located in trunk rh side i put it in lights work but running lights dont come on then my battery dies evrytime i turn my lights on then airbag light came on also could it be that my batt or altenator is going

 

You're in the wrong forum for your car. Try posting in the X300 forum which covers your car.

 

Ambition:
If you could take a moment and write a description of your problem with complete thoughts organized into common English sentences you will probably find some help here.

 

my jaguar runs 20 min starts flashing instrament cluster .runs very rough ,stalls transmission light comes on first then air bag symptoms start at this time

 

sorry to confuse u .my 1995 jaguar xj6 has an electrical issue .when driving car for approx 20 min vehicle exhibits dash gauges and lights go on and off as if some one cycling ign switch on and off .then vehicle runs very rich overheating catalytic converters .vehicle stalls .runs normal when vehicle first started in the mornings .again sorry for the misunderstanding

 

Have a look at some of Doug Dwyer's posts about failing ignition coils. It sure sounds a lot like that could be your problem.