Quote:
Originally Posted by Hummelr
I tried the test that javelin suggested. I received the new board from Thor today. No luck. I tried to trace the wires but get lost under the RV. What I did discover is that if I connect either black wire from the gague attached to the tank to just 1 wire (either white or orange) i do get a reading of 2/3 which is about what the tank is reading. If I connect both black wires to either the orange or white I also get 2/3 reading. If I connect all 4 wires together, I read empty again
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Well getting a resistance measurement of 68 ohms is encouraging assuming this is your resistance reading across the two black wires coming from the propane dial sensor mounted on the tank. Since there are two wires coming from the propane tank dial sensor back to the level sense control panel it suggests that the control panel likely provides a ground and some positive voltage via the “green circuit board” electronics for the propane tank dial to function correctly via changing resistance. If there was one wire coming from the propane tank dial sensor then it would be likely that the dial would be grounded at the propane tank and the single wire would be the resistance wire sense signal going back to the level control panel.
Maybe the 5 amp fuse that blows powers the propane gas detector as well as the green level sense control board (and maybe some other low current “control” items as you describe not working when this fuse blows). Maybe when you short all four wires together you are blowing the 5 amp fuse? Maybe shorting the orange and white together is actually causing the fuse to blow? You don't mention where the orange and white are coming from unless I missed it.
Replace your 5 amp fuse with a good 5 amp fuse and using your voltmeter setting, measure the voltage on both the separate orange and white wires with respect to a “known good” ground. What voltages do you measure? Do not accidentally touch the orange and white wires together or to coach ground. Also keep the two black propane dial sense wires from touching either orange or white for this test. Now remove the “good” 5 amp fuse and re-measure your two voltages (on the separate orange and white wires) referenced again to a known good ground. Has anything changed?
Part of this problem is trying to determine what is being tested and if the black wires are being connected to the green level sensor board correctly.
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