| Re: [GMCnet] What I found out about my LP gauge/wiring [message #316693 is a reply to message #316666] |
Thu, 27 April 2017 11:35   |
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 To check the sender, you need to measure the resistance between the screw where the terminal attaches and ground. Like I said in a previous post, I think it is a standard 0 - 90 ohms. Half full would be about 45 ohms. I could be wrong, but if there is gas in the tank, there should be some resistance.
I am reconnecting my monitor panel wiring where a PO cut the wires and threw the monitor panel in a box. Dunno why the wires had to be cut, the connector would have tucked into where he had the loose wire bundle (shrug). I am trying to figure out how the gauges work. My first guess is that they act like ohmmeters (ammeters with a series resistance). When you push the button, it powers the ohmmeter. That measures the resistance across (current through) the sending unit. When you push the button, that puts the gauge in series with the sending unit, with 12VDC pushing on one side of the gauge/meter, through the sending unit, to ground.
The LPG tank itself needs to be grounded to complete the circuit, because the sender grounds to the tank. You need continuity from the monitor panel connector LPG lead to the LPG sending unit. Expanding out from that, you should see the same resistance at the monitor panel LPG lead of the panel connector (to ground) that you do at the sending unit (to ground).
Lots of things can go wrong. Corrosion at the connectors, broken wire, shorted wire, stuck float, ungrounded tank. You get the idea.
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