Two problems here

[holtyrd]

I have two problems with the electrical system.

The first has to do with the turn signals. When I turn the switch one way, both lights blink. Only one turn signal is illuminted in the dash though. I'm lost here...

The other thing is the tach. When I turn the key on it pegs high and stays there.

73 240z

Any suggestions?

Rich

[Arne]

Yeah, your tach is bad internally. It will need to be replaced, as so far no one has successfully repaired one.

As for the turn signals, I suspect a bad turn signal switch.

[ktm]

If you are up to it, just swap the tach out for a 280z tach and switch the 280z faceplate with the 240z faceplate. You will have to do a little bit of rewiring as the tachs operate off of slightly different signals, but it eliminates the troublesome inductive loop on the 240z tachs.

[Arne]

A '73 240Z should not have the inductive loop. It should be a three-wire tach.

[EScanlon]

If you are up to it, just swap the tach out for a 280z tach and switch the 280z faceplate with the 240z faceplate. You will have to do a little bit of rewiring as the tachs operate off of slightly different signals, but it eliminates the troublesome inductive loop on the 240z tachs.

This presumes that you can re-wire the ignition system of the car to do away without the "troublesome inductive loop" that is an integral part of the ignition system.

While this may have worked for you, this is neither as simple nor an all-encompassing a fix as it sounds.

2¢

E

[EScanlon]

A '73 240Z should not have the inductive loop. It should be a three-wire tach.

Not necessarily.

A 4 wire Tach is more common on these...except for the LATE year 73's.

E