1983 Camaro Berlinetta, V6...ignition coil

[vzfox]

This is kinda a continuation of the "tachometer" questioning.....

Let me start simple and move up from there....On my ignition coil there are 4 wires. Standing on the passenger side, looking at the coil on the left side are two pink wires and on the right side is a yellow and brown wire. With the car running, all 4 wires read 13-14 volts. If I unplug the yellow wire, the tachometer reads 0rpm, but plugged in it max's out at 7000rpm.

Is it just me, or are the voltage readings from the ignition coil reading incorrectly? If you apply 12 volts to the tach, it's going to peg out, right?

This is a new ignition coil, but my old one did the exact same thing. The car runs, idles and drives just fine.....it's just the tachometer signal dont seem to be correct.

What could the problem be?

[Morley]

Third gen tachs are known for going bad as they get older. The majority of the time they read too high and get worse as time goes by.

Originally Posted by vzfox

This is a new ignition coil, but my old one did the exact same thing. The car runs, idles and drives just fine.....it's just the tachometer signal dont seem to be correct.

What could the problem be?

[vzfox]

You may be correct, but can you tell me that the signal coming from the ignition coil is correct? Are all 4 leads suppose to read 12 volts?

[Morley]

Originally Posted by vzfox

You may be correct, but can you tell me that the signal coming from the ignition coil is correct? Are all 4 leads suppose to read 12 volts?

Off the top of my head. I don't know and can't compare with my car even, since I only have 2 leads on my coil. But if you replaced the coil and got the exact same results, suspect the tach immediately.