Ok I hooked one of these up to my 68 Cougar. Sure seems that I have ut hooked up corectly.
Starts good but is working like when the tach is unpluged. Shuts off as soon as you let go of the key.
Most likely the connector that slips on the I terminal is not making a good connection. You might need to squeeze it a bit to make it connect well. This is a very common issue with these push on connectors.
During cranking the I terminal will output 12 volts to the wire that goes on that terminal. That wire then goes to the coil bypassing the resistor wire giving you higher voltage during starting. During run the wire becomes the source of trigger voltage to pull down the relay.
If you have a test light you can put the key in the run position and probe that connection and see if power is there. It should light up the test light, but not super bright.
Although the relay will pull down at about 7 1/2 volts, it only needs about 3 1/2 volts to stay latched. When cranking the blue trigger lead sees 12 volts from the I terminal.
Well, I received Bill‘s relay kit today and I am extremely happy as it resolve two issues that I was dealing with on the car. First, I was having a cold start issue which seems to be considerably better now that I have 12 V to the electronics.
The second issue that it resolved was that now my original cougar tach is working, which was hit and miss before.
The kit was incredibly easy to install in about 20 minutes and looks very professional.
Nice job, Bill!
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That looks great. I usually hide it under the solenoid but this gives you very easy access to the fuse. (pull it an the car won’t be starting!)
My eyes were opened when I did this the first time. I thought that my car had a radical cam causing the crap idle. Moved power for the Pertronix from the coil to 12 volts and it ran much better.