12 fuse box

Submitted: Saturday, Oct 12, 2013 at 20:13
ThreadID: 104697 Views:1621 Replies:3 FollowUps:3
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Hi, could any explain why there is power on both side of my fuse box (for camper trailer accessories) when the fuse in not in the holder. It is sci r3-82 fuse holder.

Thanks

Dave
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Reply By: olcoolone - Saturday, Oct 12, 2013 at 20:45

Saturday, Oct 12, 2013 at 20:45
There probably isn't are you using a standard globe test light or a multimeter.

Standard glode test lights can give a false indication but if used right can also be used as a good fault diagnostic tool.
AnswerID: 519611

Follow Up By: Dave 14K - Saturday, Oct 12, 2013 at 21:00

Saturday, Oct 12, 2013 at 21:00
I used a multi meter, when i put it on the post that has the power going to the fuse box, it reads 12.4v. on the other side, where the fuse would go, reads 11.0v.
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FollowupID: 799772

Follow Up By: Erad - Saturday, Oct 12, 2013 at 22:41

Saturday, Oct 12, 2013 at 22:41
Do you have a battery in your van? I suspect that 11V is from the battery, 12.4 is from your car battery which was connected at the time.
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FollowupID: 799780

Follow Up By: olcoolone - Sunday, Oct 13, 2013 at 09:53

Sunday, Oct 13, 2013 at 09:53
Is this when the tow vehicle is disconnected or connected, try disconnecting the tow vehicle and trying it again.
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FollowupID: 799801

Reply By: The Bantam - Saturday, Oct 12, 2013 at 23:06

Saturday, Oct 12, 2013 at 23:06
One of the issues with modern multimeters is they are very high impedance....they place no significant load on the circuit.

So they can tend to read voltage where there is only leakage and no solid connection.

That leakage can come from a number of sources.
One of them is a poor earth.

If one of the earths is poor voltage can go out on one circuit thru the common poor earth and back thru another circuit.

There may also be some sort of second supply, like a second battery or a back up battery is some sort of accessory.

Or there might be something dodgy like two wires crushed together.

as has been said try with a test lamp.

cheers
AnswerID: 519618

Reply By: cookie1 - Sunday, Oct 13, 2013 at 08:57

Sunday, Oct 13, 2013 at 08:57
Looking up your listed fuseholder it has the option of an LED to indicate a blown fuse - this fuse needs a load on the other side for a reference to ground to light up but it will not pass sufficient current to juice up your device, if you disconnect the load at the terminal block it should go out.

cheers
AnswerID: 519628

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