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piavis(at)comcast.net
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 Posted: Fri Dec 22, 2006 10:32 pm Post subject: Voltage Across Open Batt Contactor |
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After connecting the battery contactor per Z-13, is it common to have about .04 V across the contactor when open? I’m sure I’ll have plenty of basic Electrical 101 questions as this is sure my weak area on this RV so far. But I’m learning!
Jim
-7
Redmond, WA
[quote][b]
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Bob McC
Joined: 09 Jan 2006
Posts: 258
Location: Toronto, ON
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| Posted: Sat Dec 23, 2006 8:45 am Post subject: Voltage Across Open Batt Contactor |
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Jim;
If the contactor is open and there are any loads connected on the downstream side then you would expect to see approximately battery voltage across it, just like any other open switch with a load attached. However if there are absolutely no loads at all attached then you would see no voltage across it as there would be no return path for the electricity to complete your meter circuit and it would read zero. The reading you are getting is so close to zero that you should conclude that you have essentially no loads connected downstream of the contactor, but there is a tiny leakage sufficient to provide a return path and indicate on your meter. Depending on your meter, this resistance would be in the millions of ohms indicating, perhaps, simply the insulation resistance to ground of some component or other. (quite normal) If you turn on anything downstream then you will get a reading of battery voltage if all is well.
Bob McC
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_________________
Bob McC
Falco #908
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