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04-04-2020, 08:36 PM | #1 |
Junior Member
Join Date: Oct 2019
Posts: 12
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gas gauge 1939 tonner
what should be the voltage at the connection on sending unit with the wire disconnected?
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04-04-2020, 09:03 PM | #2 |
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Join Date: Nov 2012
Location: Wichita KS
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Re: gas gauge 1939 tonner
On the connection itself? zero, it is a path to ground. The current flows from the gauge in the instrument panel to the sender to ground.
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04-04-2020, 09:26 PM | #3 |
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Join Date: Oct 2019
Posts: 12
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Re: gas gauge 1939 tonner
I installed new sending unit, gauge not showing anything truck has been sitting for 35 yr. don:t condition of gauge itself any ideas
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04-04-2020, 09:39 PM | #4 |
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Location: Minnesota, Florida Keys
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Re: gas gauge 1939 tonner
Same old problem. Ford gauges use the "King-Seeley" system which works differently from most other systems. Most (probably all) replacement sending units are the resistance type and won't work well in Ford systems. Touching the wire to ground should make the gauge move. If it doesn't, either the gauge or the wire to it is bad. Try a jumper from the terminal on the gauge to ground. No action, the gauge is bad; if the gauge moves, the wire to the gauge is bad. Only touch the wire to ground for a short time or you will have other problems.
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04-04-2020, 09:53 PM | #5 |
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Join Date: Nov 2012
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Re: gas gauge 1939 tonner
I assumed we were talking original here, see that is not the case! Still zero at the sender connection, but it will be a resistance unit.
Last edited by JSeery; 04-04-2020 at 09:58 PM. |
04-04-2020, 09:57 PM | #6 |
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Re: gas gauge 1939 tonner
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04-05-2020, 09:24 AM | #7 |
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Re: gas gauge 1939 tonner
Will this little pictorial help in checking your set up?
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04-05-2020, 09:28 AM | #8 |
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Location: upstate SC
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Re: gas gauge 1939 tonner
run a ground wire from one of the screws holding the gauge to the tank to a good clean location--grounded mine to the cab back wall with ign on, if you momentarily touch the gauge wire to this ground does the gauge on the dash work?
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04-05-2020, 10:07 AM | #9 |
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Re: gas gauge 1939 tonner
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