morph Posted June 9, 2005 Report Share Posted June 9, 2005 My '80 TR7 DHC 8v currently has some sort of bizarre electronic ignition amplifier fitted retaining the points and condenser. I am upgrading to a Newtronic ignition. I need to check whether I have a ballast resistor. I understand that a test with a volt meter will tell me of it's presence (12v engine off, 9.5 cranking, 6 volt engine running - measured at the coil I think) but if that proved its presence where do I find the pesky thing. Yours (bored of looking for something that I wouldn't recognise if I found it) Morph Quote Link to post Share on other sites
Andy Moltu Posted June 10, 2005 Report Share Posted June 10, 2005 Isn't it built in to the supply feed to the coil. (resistance wire) The simplest way is to run a new feed to the coil that comes on with the ignition switch. Quote Link to post Share on other sites
malcolm Posted June 10, 2005 Report Share Posted June 10, 2005 That's right, it's a resistance wire. Malcolm. Quote Link to post Share on other sites
jonlar Posted June 10, 2005 Report Share Posted June 10, 2005 Morph, you will need to make sure that the Piranha/Newtronics is fed with the full 12 Volts. Quote Link to post Share on other sites
morph Posted June 11, 2005 Author Report Share Posted June 11, 2005 Thanks guys Quote Link to post Share on other sites
tr7v8 Posted June 11, 2005 Report Share Posted June 11, 2005 does this mean my electronic ignition I installed on my '81 TR7 is running on 6 volts... Bizarre, Surprised its working at all - I will have to go check Quote Link to post Share on other sites
jonlar Posted June 12, 2005 Report Share Posted June 12, 2005 Tom, it depends where the supply for the unit is getting it's power from. If it's from the supply to the coil and there is a ballast resistor in the supply, the voltage will be lowered; if it's on a switched supply from a relay or the ignition switch it shouldn't be reduced. Quote Link to post Share on other sites
tr7v8 Posted June 14, 2005 Report Share Posted June 14, 2005 yes the unit get it's power from the coil as there is only two wires, one to coil +ve, one to coil -ve. Looks like I will be running even more extra wires round my car Tom Quote Link to post Share on other sites
tr7v8 Posted June 14, 2005 Report Share Posted June 14, 2005 I wonder how long it would of taken me to realise the voltage differance otherwise, I expected a ballest resistor to be next to the coil, couldn't see one, so assumed there wasn't one, Well I now have another wire neatly soldered into the switched ignition, and it still works, surprising thing is the engine seems no different idling, wonder what it'll be like when I take it for a run, Ill let everyone know tomorrow, as I'm off to Brunel TR's Tom Quote Link to post Share on other sites
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