American Motors/73amx tach

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Expert: Kevin Pilotte - 4/30/2007


Question
I replaced my gauge cluster with one from my 73 Jav parts car
and the tach would not work on either one.  I ran into the same problem when restoring my 69 Jav. This means I have four tachs that don't work?  Is there a way to bench test these tachs without expensive diagnostic tools?  

Answer
The 73 repair manual does not give any diagnostics for a tachometer. However, you should be able to test it by connecting it properly.
The tach has a (+) & (-) terminal.
The (+) runs to the terminal with the yellow wire at the solenoid.
The (-) terminal goes to the (+) side of the ignition coil.
If it doesn't work, disconnect the yellow wire at the solenoid and connect the (+) of the tech to the terminal by itself.
If it still doesn't work, your tach is probably shot.

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Kevin Pilotte

Expertise

I can answer many technical questions relating to AMC vehicles prior to 1979. I also have experience with Rambler & Nash vehicles.

Experience

I am a former AMC technician, service writer and service manager. I have worked in AMC dealers in Illinois in the 70's. After college, I was a Field Service Rep for American Motors Sales Corporation, working out of the Chicago Zone office. I traveled to AMC dealers assisting in the diagnosis and repair of AMC vehicles. I was also the Area Training Manager for DeLorean Motor Company. I have 10+ years as an Automotive Instructor. I have modified and restored
numerous AMC vehicles. I have been working on AMC vehicles for over 30 years.

Organizations
I have been an ASE Certified Master Technician since 1975. This includes L1. I am also currently a Toyota Certified Master Diagnostic Technician.

Publications
I have articles in "American Motoring", the official publication of the American Motors Owners Association. They are the largest AMC club in the world.

Education/Credentials
I have a certificate I printed out from a website.

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