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Old 08-14-2007, 07:04 AM
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FlatHead Ford Temp sensors.

Subject: 1949 Ford F-1 truck (12v conversion).

Does any one out there have a simple wiring diagram of the temp sensors?

Does anyone out there have resistance readings of the temp sensors?

Any info will be greatly appreciated.

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Old 08-19-2007, 12:50 PM
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This is the best I could find...www.firstcoastf100f1.com ...hopefully some of those guys can help you, good luck.
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Old 08-19-2007, 05:49 PM
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Doc here,

Assuming you retained the STOCK Flattie..those should be Mechanical..no resistance involved except for the Fuel gauge...

IS your's Different?

IF so, the gauge is dependent on the resistance of the sender for accurate reporting...Find the aftermarket maker and call or email them for specific information on your gauges..

If that is NOT possible, there is a way to determine (within a few index readings) what resistance values you need to look for in sender units..

For instance, The Ford Fuel Sender will be 30 ohms..always was under a certain date..(60 something IIRC..)

Get the following Values from Rat Shak or Fry's , 1 WATT Resistors or higher, 30, 60, 90, 120, 140/50 , 160, 180, 220, 240/50, 260 OHMS...THEN get 2, 5 watt Potentiometer's, linear tapers, (a Guitar Repair shop is the best place for these..Volume/Tone Controls off the axe..)

Wire Power and ground up accordingly..be sure the gauge works, open the line (no sender) the gauge should peg one way..(usually full, 60 psi, or hot) , Then Ground the line, it will peg the other way..empty, "0" or cold) If you have this, the gauge works and the sender WIRES are good to the senders..on to testing..

starting with 30 ohms and going up, (and a dead cold, or "0" psi, or empty tank ) add a resistor to the sender line and ground the other end..the gauge should / Might move slightly toward the First index line..This value is the closest you want..for sender resistance..say , 30 ohms..then keep going until it pegs out the gauge (last index line not off the scale) say, 90 ohms..OK, the sender you want is 30 to 90 ohms..order accordingly..

IF you are a perfectionist..AND I ALWAYS do this for fuel senders..

Get out your linear tapers..(adjustable 0 to 50 ohm pots like an old volume control knob, before mankind got lazy..)

For fuel, put in your sender, read the meter..should be somewhere around "E"... ADD 2.5 Gallons of Gas to the tank, then roll the pot BACK to the "E" line.. You'll NEVER run out of Gas!!

Same applies to temp. use an accurate lab or meat thermometer in the Media stream..note the temp..If you have some difference Between the Gauge and the Lab thermometer, add your linear taper, and adjust for the media stream temp.

When you all done, use epoxy, nail polish (sorry Honey.., ) or Silicone to "Pot" the taper Closed and water tight, then mount up out of the way , and be sure the shaft seals so it won't move and change calibration.

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