Monitor Panel Problem [message #250561] |
Sat, 24 May 2014 20:03 |
SThornbg
Messages: 127 Registered: September 2011
Karma: 0
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Once again, I need electrical guidance........... '77 Palm Beach
When I activate the monitor panel I get the following - LP gauge remains at zero where it always resides even with a full LP tank; Volt meter moves to 13+ volts with the smart charger connected; the water tank gauge goes from zero to below zero and the holding tank gauge goes from zero to below zero. The switch appears to be functioning as the panel lights do turn on.
I have been told this is probably a grounding problem. I just put a fresh ground wire from the aluminum panel beneath the water pump to one of the mounting screws on the water tank sending unit - no improvement. With the panel switch turned on, voltage across the water tank sending unit is about 8.5.
Both the water tank and the holding tank are empty, but the gauges act the same with fluid in the tanks.
Any suggestions are appreciated.
Steve Thornburg
South Bend, IN
77 exPB 455 "Tinker Toy"
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Re: Monitor Panel Problem [message #250566 is a reply to message #250561] |
Sat, 24 May 2014 21:03 |
Carl S.
Messages: 4186 Registered: January 2009 Location: Tucson, AZ.
Karma: 13
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Senior Member |
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SThornbg wrote on Sat, 24 May 2014 18:03Once again, I need electrical guidance........... '77 Palm Beach
When I activate the monitor panel I get the following - LP gauge remains at zero where it always resides even with a full LP tank; Volt meter moves to 13+ volts with the smart charger connected; the water tank gauge goes from zero to below zero and the holding tank gauge goes from zero to below zero. The switch appears to be functioning as the panel lights do turn on.
I have been told this is probably a grounding problem. I just put a fresh ground wire from the aluminum panel beneath the water pump to one of the mounting screws on the water tank sending unit - no improvement. With the panel switch turned on, voltage across the water tank sending unit is about 8.5.
Both the water tank and the holding tank are empty, but the gauges act the same with fluid in the tanks.
Any suggestions are appreciated.
Steve, I've been battling the same issues with mine. Last year, I got a two for one deal on new sending units for both tanks from a former GMCer who sold his coach before installing them. I installed them and tested them as I went. Outside of the tanks, they would move the needles on the gauges, but installed, they would not, or would work intermittently. I even replaced one of the gauges with a NOS unit from Jim K. The ohm readings seem to be OK, but for some reason, I can't get the gauges to work consistently. I'm thinking too, that it might be a ground issue, but really haven't delved into it yet. What baffles me is that the light in the panel works, so that would indicate an in tact ground.
Hopefully someone can help both of us get to the bottom of this problem once and for all.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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Re: Monitor Panel Problem [message #250647 is a reply to message #250574] |
Mon, 26 May 2014 10:00 |
SThornbg
Messages: 127 Registered: September 2011
Karma: 0
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Senior Member |
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OK, water tank is full, fresh ground wire to the aluminum body, monitor panel switch on, the gauge goes negative to the peg. Voltage from the yellow wire to ground is 8.5 volts - I did not remove the yellow wire from the sender to measure the voltage. Looks to me from the wiring diagram that the yellow wire should be carrying 12 volts from the purple wire that comes from fuse #3.
LPG gauge holds steady at Empty and the gauge on the tank reads empty - again a fresh ground on that one.
I have not looked at the holding tank as yet. It is empty and that gauge on the monitor panel makes a negative move when the switch is turned on.
???????????????
Steve Thornburg
South Bend, IN
77 exPB 455 "Tinker Toy"
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