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Posted by Will (in IL) [98.215.26.138] on Saturday, September 10, 2011 at 18:17:41 :
While doing some wiring cleanup and investigation on my '64 W500 Power Wagon Fire Truck, other than a lot of bad and dangerous wiring I found a strange connection.
The truck had the 6 gauge dash with electronic Stewart Warner Tachometer, and I found the added signal wire connected to the coil on the distributor side. Then I found that the coil "+" wire in the stock harness did not go to the coil. It was attached to an added wire by the Maxim Fire Company that ran back with the wires to the rear of the truck. A wire running back in the same bundle was attached to the coil "+" side.
So I wondered if I'd missed a manual kill switch on the Fire Bed. So I took another look and could not find any. I continued to clean up the wiring. I found the oil pressure wire but I didn't find an additional Tachometer signal wire running to the Fire Bed Tachometer.
The Faria Tachometer on the Fire Bed worked, so then I started some research. It turns out that Faria is a Series Tachometer! Hadn't ever thought about how the older Tachometers worked, but now I know.
I'm down to three unknown wires, and I suspect one is the Power feed for the Hour Meter and Oil Pressure Gauge, while the other two were for the hose real motors.
I now need to pick up some 8ga wire, and re-wire the alternator so that it bypasses the Amp Meter, and figure out how I want to replace the Fuel Gauge so I can install a Volt Gauge. Anyone know the Ohm rang for the Dodge Truck Fuel Gauges?
You have got to love cleaning up a botched wiring job, but that should make the Fire Truck Safer while it's driving.
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