MarkB Posted April 13, 2012 Share Posted April 13, 2012 Hi AllI think I have asked this before but I have been trying to test a couple of Smiths electronic rev counters that I have had in the loft for years. Both were working when removed from Mk4 Spitfires. I only have a Mk3 at the moment so can't check how they are wired. I wired the bullet connection to the negative side of the coil, the spade to the live on the battery and the spade on the body to earth. I can't get either to work wiring this way and was wondering if I was missing something, like do they need to go through a voltage regulator of is that only for the fuel and temp gauges. Any advice appreciated.Mark Link to comment Share on other sites More sharing options...
Nick Jones Posted April 13, 2012 Share Posted April 13, 2012 I always struggle to remember which is the supply and which is signal out of the bullet & spade.However, I think you have it right and what you describe ought to work (provided coil negative is connected to the points). Nick Link to comment Share on other sites More sharing options...
andytr6 Posted April 13, 2012 Share Posted April 13, 2012 Pretty sure the spade is +12v power and the bullet is signal. Connect the signal to coil negative.This was advice from another member that worked for me! Link to comment Share on other sites More sharing options...
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