Tachometer don't work...

[Jean-Pierre]

Hi guy's

On my 73', the tachometer don't work. I receive the car like that. It never worked.

I looked for the cable to repair it but I can't find anything.

Normally, there is a electrical cable that goes to the ignition coil and that works with the pulses, no ?

It's not like that on the 73' ?... :huh:

 

[LeglessOne]

Hi Jean-Pierre

Link to the wiring diagrams - hope this helps

https://www.7173mustangs.com/misc.php?page=diagrams

Regards Shane

 

[Jean-Pierre]

Thank you, it's very nice.

I opened but, frankly, I'm not good enough in electricity.

If someone had a simpler solution...

 

[TheRktmn]

The factory tach runs off the + side of the coil. Simply put, the wiring is:

12V from ignition switch goes to tach red wire, through tach, out on black wire, through the 'pink' resistor wire to the coil + terminal.

If the tach fails then the car will not run, so many of the tachs are unplugged and a jumper put in place of the tach so the car will run.

 

[Carolina_Mountain_Mustangs]

Humm, My tach does not work of 73 vert but car runs fine?? The wire is not jumped either I had entire dash out and put back it is plugged in. I even changed the tach and still did not work so I quite worrying about it and just drive the car.

 

[TheRktmn]

The tach can fail for a variety of reasons - the most talked about is transformer failure - this causes an open in the primary circuit so the car won't run. Probably the second most common issue is a dirty or worn movement, then dried out capacitors.

 

[Jean-Pierre]

I'm going to do a wire search to see if it has not been jumped...