Well more a forum entry actually from Tom in the USA via the great www.triumphtr7.com. This is going to be the first port of call on the weekend. I am almost exited!
hi steve, here is how to check the ign power circuit.
part 1: you will find a solid white wire on the ballast resistor and also a white/yellow wire. check to see that the white wire has power at all times the key is on. the white/yellow wire will show some voltage, but less than battery volts in run. when in start, the white/yellow wire should have full battery volts to improve the spark for starting. this wire comes from the starter solenoid.
Part 2: if all this is happening, check at the coil + terminal for voltage with the key on and for higher voltage when cranking.
if part 1 is ok and part 2 is not, you have a fault in the resistor pack, if part 1 is ok as well as part 2, the symptoms you describe usually indicate a bad module in the distributor.
this applies to all factory tr8, with original dist and resistor pack.
part 1: you will find a solid white wire on the ballast resistor and also a white/yellow wire. check to see that the white wire has power at all times the key is on. the white/yellow wire will show some voltage, but less than battery volts in run. when in start, the white/yellow wire should have full battery volts to improve the spark for starting. this wire comes from the starter solenoid.
Part 2: if all this is happening, check at the coil + terminal for voltage with the key on and for higher voltage when cranking.
if part 1 is ok and part 2 is not, you have a fault in the resistor pack, if part 1 is ok as well as part 2, the symptoms you describe usually indicate a bad module in the distributor.
this applies to all factory tr8, with original dist and resistor pack.
Note to Fil: if you could pick the brains of the Lucas God that would be handy! I am getting a spark on one of the plugs when I turn the key. As soon as the key is in the "rest" position, bye bye spark. I am led to believe that it could be the ballast resistor, the distributor or the coil. The above forum posting may point to the problem. I now have a spare ballast resistor to check, but if your Dad has any further ideas, please let me know!
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