67 ammeter problem | Vintage Mustang Forums

The ammeter is in parallel with the shunt/main circuit that most of the current flows thru in/out of the battery. If the set is not wired correctly most/all of the current will pass thru the ammeter and this is dangerous as the wiring and gauge is not sized the handle it. Here is a simplified diagram of the Ford 1G charging system with shunt ...

Variety of 1967 mustang wiring diagram. A wiring diagram is a streamlined traditional photographic representation of an electrical circuit. It shows the parts of the circuit as simplified shapes, as well as the power and also signal connections between the devices.

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Install an amp gauge in your car and you will instantly know the general condition of your vehicle's electrical system. Also known as an ammeter, this is one of the instruments that has largely been replaced with an idiot light. Without it, you will not know there is a problem until it is too late. The amp gauge ...

67-68 Shelby Ammeter Gauge Wiring Harness The 1967 and 1968 Shelby GT350 and GT500 were equipped with "add on" oil pressure and ammeter gauges. We now have the wiring harness feed that runs from the ammeter gauge to the junction block that is located under the hood near the starter solenoid.

1967 Mustang Instrument Panel Pictorial Instrument cluster connections, wiper switch, headlamp switch, ignition switch and lighter 1967 Mustang Ignition, Starting and Charging Pictorial and 6-Cylinder Ignition Schematic or Schematic Alternator, regulator, solenoid, starter, distributor, plugs, ammeter and starter neutral switch 1967 Mustang Exterior Lighting, Turn Signals and Horns Pictorial ...

If you have an early, '66 or later, Mustang ammeter that will peg at 60A, which BTW would be very useful, then the ammeter is not the original one Ford installed. The reason modern cars have voltmeters instead is because the makers are cheapskates (pardon my French), like Henry Ford was, that don't want to install wire that is heavy enough to do the job required of an true ammeter.

The yellow wire (B) coming from the charge side of the ammeter goes through the wiring harness and ties into the 10 AWG cable which goes between the hot side of the starter solenoid and the alternator. The points at which the two wires connect to the solenoid-to-alternator cable are about 23-1/8" apart.

The ammeter coil itself is about 1/6 Ohm but when you include the red and yellow wires to and from the purple wire the total impedance for current flow through the ammeter wiring is right at 1/4 Ohm. I give example numbers for an alternator charging 100 Amps into the battery.