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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..
We are wrapping up our testing on a New EFI retrofit kit for the 1975-1983 Datsun 280Z and 280ZX (non Turbo). This system is based around the FAST EFI self learning fuel inejction system. This is a modern day state of the art system that will bolt up directly to your 280Z and replace all stock fuel injection (including ECU and AFM) components except for the fuel injectors. The system will use New GM sensors and will be a simple bolt on installation with no tuning experience and no laptop required. This system is targeted at the Datsun owner who simply wants their car to run right so they can enjoy it with as little headaches as possible. However this system is capable of supporting up to 600HP so any mods to the engine (except turbo) will be welcome! In our first test we were able to pickup about 8 HP and 6.6 lf/ft torque at the wheels with changing the fuel injection only. https://zcardepot.com/fuel-injection-retrofit-kit-fast-efi-280z-280zx.html