Dash Instrument Testing

Posted on Feb 5, 2014

The Fuel and Temperature gauges as used in the 1960 - 1965 Ford Falcon are very basic instruments whose operating principles seem to have gotten lost in this modern day era of digital electronics. In order to properly troubleshoot the circuits you will need an ANALOG voltmeter and 2 `D` cell batteries. It is best you perform all of the troubleshoo

Dash Instrument Testing
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ting techniques before ordering parts for repair as there is a NO RETURN POLICY on any electrical items. The circuit diagram demonstrates that both the Fuel and Temperature gauge circuits receive their operating voltage from the same Instrument Panel Voltage Regulator. So what affects one circuit will also affect the other circuit. I. E. If one gauge is inaccurate the other gauge may also be inaccurate. G‚Remove the screws that retain the instrument cluster to the dash. Disconnect the speedometer cable from the rear of the instrument cluster and pull the cluster forward. You should be able to access the rear of the cluster and lie it on the steering column. A towel would help prevent the column paint from scratches. Turn the Ignition Key to the "ON" position. Check the voltage on the "Green-Black" wire at one of the gauge connections. The voltage should fluctuate between Zero and Ten Volts. This is the same Voltage that will be seen at the connection of both sending units. Connect 2 "D" cell batteries in series so you will have a 3 volt output. Connect the battery output to the terminals of the Fuel or Temperature gauge. Connect the Positive Battery output to the "Black-Green" terminal and the Negative Battery output to the "Yellow-White" terminal. The gauges should read "Full" or "Hot" respectively. If not, replace the gauge. One item that is often overlooked is the Grounding System. The Engine and Chassis must both be...

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