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Voltage at propane tank solenoid

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mopoulter View Drop Down
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    Posted: 04 July 2017 at 18:48
My Propane shut off switch is not working. The switch may be faulty but when I was testing the connections I found that there was only 11 volts between the hot end and the ground of the fuse. 
(by passing the switch). 11 volts seems weird to me  batteries are fully charged and volt meter says 14 volts or so when charging. and about 12.8 to 13.5 when charger is off. 
Any one have an idea where 1.8 volts is disappearing? 


mp

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Post Options Post Options   Thanks (0) Thanks(0)   Quote High Time Quote  Post ReplyReply Direct Link To This Post Posted: 04 July 2017 at 19:22
Is the shut-off solenoid (presumably) part of an automatic gas detection alarm system or simply wired to an on/off switch that you operate manually?

If part of a gas alarm system the voltage may be regulated within the sensor/alarm unit.

Alternatively, it's also possible that the solenoid draws several amps in the open state which could cause 1.8V drop if the wiring/connections are not properly sized for that sort of current. 


Edited by High Time - 04 July 2017 at 19:24
Roger

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Post Options Post Options   Thanks (0) Thanks(0)   Quote mopoulter Quote  Post ReplyReply Direct Link To This Post Posted: 05 July 2017 at 15:58
No there is no gas alarm system.
There is simply a on/off switch that opens the solenoid. It was functioning until a week ago when it stopped.
My examination of the voltage between hot end and ground was when I read the 11 volts,  jumping across the switch does not open the valve but the connection is poor.
I have ordered a new switch perhaps this will solve things.
Also I can't imagine that the switch would dram large amount of amps.
Thanks for your suggestions
  
mp

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Jens View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jens Quote  Post ReplyReply Direct Link To This Post Posted: 08 July 2017 at 08:02

I had problems with my fridge some time ago. The light was working, but when compressor tried to start voltage dropped down and light went out. I found out that there is a connector close to the compressor and this was completely corroded. Problem was that the connector was lying on the boat bottom below the compressor where it occasionally got in contact with water. Maybe the cable to your propane solenoid is also under the floor. In case the switch does not fix the problem, it would be a good idea to try with a + and cable directly from the battery.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote mopoulter Quote  Post ReplyReply Direct Link To This Post Posted: 11 July 2017 at 16:50
Spent most of Friday trying to trace wire, found it disappearing under cabinets next to stove!!! Thought Ok will need to run a new line or pull cabinets! Later a friend who is a millwright looked at problem,  he actually used to fix robots on an auto assembly line so he knows his stuff.  He looked and found the inscrutable 10-11 volts as well even when we grounded to ground wire on throughhull. He could not understand it either. So he suggested just for "smiles and giggles" lets hook up the whole system as if nothing was wrong and cut the wires at the solenoid  to see what voltage is there. There was 12.8 volts????!!!!! So then we pulled the solenoid and it was seized. So I have new one on order. Go figure??? So I started at the wrong end of the system and was lead down the garden path by some wiring anomaly that perhaps only Hanse can explain.
mp

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