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footloose
RO# 6963
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 Posted - Feb 20 2012 : 09:19:42
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Gauge tested fine.
If I remove sender and connect wires up andmove the float up and down gauge works. Checked and float does float. If I ground senders metal plate to the tank it stops working and gauge shows less than E.
if I run ohm from sender terminal on sender to metal plate it shows connection. Is sender bad?
AS ALWAYS THANKS
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| Gone for a while - but the Harley is running again in trawler mode. |
Homeport: Florida
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Thudpucker
RO# 10503
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Posted - Feb 20 2012 : 12:30:02
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To me "Less than Zero" means the Voltage is connected backwards. Some voltage is going through the Meter movement to ground.
An Ohms reading from the Sender terminal (coil) to the Mounting place would say the Coil in the Sender is grounded to that Plate.
Are there two wires to the sensor?
B+------Meter>---(R)>------Sending unit>----Ground!
At (R) sometimes you see a resister herabouts so the Voltage in the sending unit isn't too high.
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| Conservative in every sense of the word. |
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Homeport: AL.
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pdecat
RO# 842
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Posted - Feb 20 2012 : 12:33:07
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sounds like a short in the sender plate.
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Bruce
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Homeport: Gulf Coast FL
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Michael Clemensen
RO# 2006
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Posted - Feb 20 2012 : 12:42:57
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With the fuel sender wired correctly and hanging in “free space” the gauge operates correctly when the float is moved, Yes? With the unit still in free space and operating put a digital multimeter on DC volts, clip the negative lead on the sender ground/metal plate and then clip the positive lead on the bare metal fuel tank and see what it reads.
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Homeport: Winthrop Harbor, Illinois
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Sandy
RO# 1159
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Posted - Feb 20 2012 : 17:56:01
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Similarly, with sender wire removed, you might try reading multitester-voltmeter with common lead on battery negative and positive lead on the tank to see if something else is backfeeding +VDC to the tank .
Is this a new sender, or one that worked OK for you until recently? What kind? And , wired separately the risng float gauge needle definitely moved the gauge needle or digits to higher readings (in the correct direction) not just moved, right?
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| Sandy |
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Homeport: The Vineyard
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footloose
RO# 6963
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Posted - Feb 20 2012 : 18:25:02
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Correct Sandy.
Thanks all...I will try the above when I get a chance. These are the original senders in an 88 boat.
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| Gone for a while - but the Harley is running again in trawler mode. |
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Homeport: Florida
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Ghost
RO# 689
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Posted - Feb 21 2012 : 17:45:53
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I think it was the other thread, someone suggested reversing the wires. Have you tried that?
1.) the sender wire is the one that is isolated usually in the center. If I remember right, you should be able to remove this and touch it to ground (or the ground edge of the sender, same potential) and see the guage move to FULL.
2.) If #1 did not work, then try reversing the wires and see if you get the proper result.
3.) If #1 works, but does not go to all the way to FULL, then you have too much resistance in the wires/terminals.
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| What part of GALE WARNING did you not understand? |
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Homeport: Everett Wa
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Ghost
RO# 689
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Posted - Feb 21 2012 : 17:49:01
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edit...re-reading it sounds as though when the guage tries to move (read towards full) it is actually going toward empty. When I said to reverse the wires, I meant at the sender end of things.
The FIRST thing you should check now is whether the volt (+ & -) wires going TO THE GUAGE are correct. Plus to positive, minus to negative. I suspect they may not be. I can't figure why it would work when not grounded (sender not connected to tank), but check this one first. Then continue troubleshooting.
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| What part of GALE WARNING did you not understand? |
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Homeport: Everett Wa
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Sandy
RO# 1159
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Posted - Feb 21 2012 : 20:54:22
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Related to what Brett said , do the other gauges all read properly?
( Sometimes if there is a bad ground connection at the daisy-chained ignition sw to gauge circuit, there can be voltage backfeed to each gauge with odd readings ot more than one gauge but not all depending on where the fault originates. Notjust ground connection either , same can happen if there is bad + VDC connection somewhere in the gauge daisy chain on the supply side if there is an available + source through a normally negative ground connection elsewhere in the circuit . I am by no means a very knowledgeable electrician, as I'm sure my suggestions confirm , but in this case it's all about the available greater potential.)
Also, you confirmed the sender was not a new installation, but is there any chance the gauge is new since you are positive all worked well? ( Just thinking if possibly Euro reverse ohms range vs US std on gauge or sender but not matched, however you did say the sender and gauge were synch-ed for movement in the correct direction ( when off the tank so it does sound that both are the probably same matched ohms std. .
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| Sandy |
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Homeport: The Vineyard
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footloose
RO# 6963
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Posted - Feb 29 2012 : 19:10:20
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As always you folks were right...bad Float sender. Thanks for your help
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| Gone for a while - but the Harley is running again in trawler mode. |
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Homeport: Florida
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wierd one .... fuel sender issue
