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Found 3 results

  1. Hello everyone I had a question about voltage. I am a newbie when it comes to wiring and electrical but I did my research and read the forums. I have a 1977 280z and it looks like someone’s been in there trying to figure out the issue. Missing bolts etc. anyways with my multimeter I tested the coil and the resistor and voltage. the voltage was off.. well there was none with the key on the on position, testing on the first terminal on the resistor. so this is what I checked, I went to the battery and checked the cables those are good, car turns over. I looked at the wiring diagram and found the black and white wire that leads to the ignition relay. That wire read at -12.45 volts. As if I I had my wires crossed on my volt meter. Then I searched and found the red and white wire that leads to the battery. And again same thing that wire read -12.45.. I went back to the battery terminals and tested there and that was +12.45. Sooo my question is why is it reading as negative in the wires? Is this normal? Andy ideas as to why the black and white wire that goes to the resistor is getting no power..
  2. Earlier today my 280Z started right up and idled just fine as it has done for the past 9 years. It was idling for about 5-10 minutes then it just dies. No stutter, no chugging, no nothing, just dies as if the spark randomly shut off. So I test my spark plugs, no spark. Inspect the distributor cap, looks good. Check the coil, no voltage signal from the coil to the cap. And that's my issue me thinks. So I pull the coil to test it. Primary circuit has 0.8 ohms resistance and the secondary has 22k ohms resistance. The values are a little out of range from what the book i have tells me, but they should still be close enough to send some sort of signal. I have 12vat the positive terminal of the coil and 12v at the negative terminal. I have no friggin clue why it died and suddenly lost all spark. I did not jiggle any wires before it died, nor did I unplug anything, it just keeled over. I can not find a Transistor Ignition Unit inside my engine bay, it was not in the location the manual said it would be. (Next to the battery) I am trying to sell my car soon as a driveable project car because I don't have the time or money to throw at restoring it and this random death of spark really dampens my day. So any help would be appreciated.
  3. This morning i decided to swap the ignitor installed on my 240z and after opening the distributor cap i notice something is missing, i guess it could be the ground wire,so i fabricated one with 2 terminals and installed a new pertronix ignitor model 1761 together with a 40511 new 3.0 ohms ignition coil. The car cranked up fine, but whenever you step on the gas the tachometer does not read correctly. Once it reaches to 5,000 RPM it jumps to 7000 goes back to zero, etc. If you have the car parked and step on the pedal it raises to 5,000 goes back to zero. Bottom line it is not Reading as it used to read with the former ignitor. What could be wrong here? Could i have missed something? I have attached pictures of the original 1761 ignitor and the one i just installed which is giving me problems. Your advice is highly appreciated.
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