Measure the resistance from the screw on the sender to ground. It will vary
between 0 and 90 or 0 and 30. Not sure on this sender. Note 0 ohms is full
scale deflection of the needle on the ohmmeter. If the reading doesn't vary
or jumps suddenly, then it is a faulty sender. Also, a bad ground from
sender will cause the gas gauge to read full all the time. This would be my
first place to look. Sometimes the wire can break at the terminal under the
insulation and the connection will look fine. Try using a jumper wire from
the sender to a ground.
> I just got the gas tank back from Mattson's Radiator after having the
>ReNew process done and decided to "bench" test the new sending unit
purchased
>during my brief flirtation with Golden State Pickup Parts.
> The simplest way to do this I figured, would be to go out to the
>truck, wire the sending unit up to the harness and power the system up
(fresh
>6v Optima) watching the gauge while moving the float by hand. The gauge
>should read "empty" with the float dangling and it should climb to "full"
>when the float is moved up. Wiring in the new sending unit makes no
>difference to the gauge reading.
> Putting theory to practice confirms that something is fouled up
>someplace. Even with the float fully down the needle rises to "full."
>Alternately removing the ground and restoring it get the needle to make a
>very slight wiggle, but alas, no movement. Touching the wires together does
>not change the gauge reading either. The gauge normally rests on "empty"
and
>goes to "full" with the key "on" even with the tank empty.
> If I could verify the sending unit is not at fault, I could go ahead
>and install it and get the tank in. I have an old Radio Shack volt/ohm
meter.
>Can I use this to verify the gauge? Am I condemned, like poor Smokey, to
>wander the highways and byways of America with no working gas gauge, spare
>gas cans always along for the ride?
>
>Paul O'Neil, Hudson29@aol.com
>1951 Chevrolet 3600 Pickup Project, See it at:
>The Poor Man's Advanced Design Tech Tips Page
>http://home.earthlink.net/~conntest47/
>Fullerton, California USA
>AEROMARK - Need Rubber Stamps or Signs? See:
>http://hometown.aol.com/hudson29/myhomepage/index.html
>oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
>
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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