| Re: [GMCnet] What I found out about my LP gauge/wiring [message #316694 is a reply to message #316666] |
Thu, 27 April 2017 11:49   |
A Hamilto
Messages: 4508
Registered: April 2011
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BobDunahugh wrote on Wed, 26 April 2017 23:23Gauge shows full all the time. Pushed the LP gauge switch. Had 12 volt on both the terminals on the back of the gauge. ( Both the red, and white wires are not connected to the tank sender. ) The white wire at the tank, But not connected to the tank sender. Is a true ground to the body. Next I need to engage the LP gauge switch to see what voltage I have at the red power wire at the tank. Shouldn't the voltage at the tank be lower? If I have power at the tank. Attach the ground to the ground terminal on the tank. It should work. If not. I need to check continuity in the sender. Bob Dunahugh 78 Royale Your symptoms indicate a discontinuity or high impedance in the circuit. Corroded connector, ungrounded tank, broken or disconnected wire, float stuck at full. Something like that. Sending unit to ground should have some resistance, but not large (~45 ohms at half full?). Resistance to ground of the end of the LPG wire at the monitor panel connector should be almost identical to the reading at the sending unit.
I guess I am saying to check resistances and continuity of wires and sender instead of volts. Once you get the wiring right, if the sender is working right, and the gauge doesn't work right, suspect the gauge.
Unfortunately, I can't tell you the right resistance readings for the sender. I am just guessing the "standard" 0 - 90 ohms (0 for empty and 90 for full).
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