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I lost power to my instruments, and it looks like the circuit attached to the board power and the wiring harness is burned out. I have called around, and most places that have wiring harnesses say they don't know what this is. It looks like a voltage reducer to me. Does anyone know what this is?
Look up an "IVR" for your truck
Not absolutely sure those old trucks had an "Instrument Voltage Regulator" or not, but if that thing was bolted to your cluster, it is most likely an IVR
Look on the back of your instrument panel for an IVR. Like the ones in the picture. Also, in later models with the printer circuit panel Ford used an 8.5-ohm resistor and a radio choke your 66 would not have had those. The part in your pic could have been a resistor if so, it isn't necessary. The diagram is from a 71-car shop manual. Ford used these King Seeley type gauges in everything for decades they all work the same nominal 5V input, 10-ohms high reading, 73-ohms low reading.
Also, is your cluster equipped with an ammeter, or a charge warning lamp?
With a lamp there could’ve been a resistor mounted somewhere. Never actually seen one from one of our older trucks though since mine have had the gauge.
Also, is your cluster equipped with an ammeter, or a charge warning lamp?
With a lamp there could’ve been a resistor mounted somewhere. Never actually seen one from one of our older trucks though since mine have had the gauge.
Since he has a 66 the only other resistor in the harness other than the pink ignition wire is a 15-ohm resistor wire that runs from the accessory terminal on the ignition switch to the charge indicator light. It is there to provide exciter voltage to the alternator if the bulb burns out. That wire isn't depicted on most wiring diagrams but is in the shop manual. If he has the Oil and Alt. gauges on the 65-66 these were and add on and could be ordered from the factory or as a dealer on owner add on. Those gauges came with their own separate harness. This is the resistor wire to the ALT. light it is paired with the BLK/YEL.
That resistor isn't used on a 1966 truck. Regardless of which IVR you ordered solid state or electromechanical you need to bench check it before you install it. Your shop manual tells how to check the original type. The solid-state ones can be checked with a voltmeter. I have encountered both types that were defective right out of the box.
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