Lucas Sport coil

[Jim_Newman]

When it comes to auto electrics, I'm a complete ditz. Does anyone know the primary resistance of an SP12 Lucas Sport coil-and does the resistance go up or down when it's on its last legs?
Cheers

 

[Keoke]

When it comes to auto electrics, I'm a complete ditz. Does anyone know the primary resistance of an SP12 Lucas Sport coil

-Approximately 3 OHMS

and does the resistance go up or down when it's on its last legs?

--Hard to say .However, it probably will go down if an internal short occurs in either the Primary or secondary winding.
-Cheers

----------------------Keoke

 

[IanIrving]

Hi Jim
It could go either way, right up if it goes open circuit or down if short circuit. Either way I think most experience is that it will go short when it gets hot so difficult to measure until you have a running problem. Easiest way to diagnose is "replace with a known good one"

Ian