zzzzdave Posted January 12, 2013 Report Share Posted January 12, 2013 Hi, Ive read some of the old posts on the subject , but not sure it answers my problem Measuring voltage on +ve side of coil , with -ve side of coil straight to earth , measures about 6V on a digital multi meter. Ballst coil fitted , and ballast wire in loom , which i can see so far so good when i connect up and run car, with car running , and measure voltage on plus side of coil, it measures about 12 V , accupspark elctronic ignition fitted , should this not read no more than 9V whilst running any ideas, it does not make sense Quote Link to post Share on other sites
Steves_TR6 Posted January 12, 2013 Report Share Posted January 12, 2013 Hi Dave Under what circumstances do you see the 6v, and then the 12v? Quote Link to post Share on other sites
zzzzdave Posted January 12, 2013 Author Report Share Posted January 12, 2013 6 volts - coil negative side , existing wire removed, and a wire straight to earth coil positive side , wire from harness connected to coil digital multi meter to coil positive side and measures 6 Volts with ignition on, car not running) This is what the Accu spark instructions i got with the car says do to prove if balast resistor wire circuit , thinking about this this is static measurement with coil not pulisng with points/electronic ignition 12 volts - all connected and car running on tick over - connect digital miulti meter red lead to positive of coil and black wire of meter to car earth , this then measures 12V, my thinking is you cannot get a accurate reading when the car is running as the electronic ignition/points negative side is pulsing as the car is running, thus you are in effect making and breaking the circuit , and thus the 12 V is a red herring and it should be measured static i.e peremenent earth on the negative side of coil Thats what im convincing myself now, does it sound a reasonable assumption Quote Link to post Share on other sites
peejay4A Posted January 12, 2013 Report Share Posted January 12, 2013 Dave, just to make sure that your wiring is as it should be, with your arrangement set up to earth the -ve of the coil, what voltage do you see on the +ve of the coil when you're cranking the engine? It should be 12v. Quote Link to post Share on other sites
zzzzdave Posted January 12, 2013 Author Report Share Posted January 12, 2013 yes just checked it cranking and 12volts is seen, with -ve side of coil to earth so i think it is correctly wired what made me look at the circuit in the first place was fitting a thatcham 1 alarm and was looking for a couple of circuits to break with the immobiliser circuits and when i started poking about with the meter , it became obvious that it had a standard 12 volt coil fitted on a ballast system, so i changed the coil to a ballast one today and started to confirm my voltage measurements . Note only had car 3 months so previos owner must have fitted the wrong coil Quote Link to post Share on other sites
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