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Ampere sending unit

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Edward Buker:
Ken,

Usually if current is to be measured in both directions you would use a dual shunt as shown in this link which would have 3 wires.

http://www.sogeman.com/DC+DMM_install.pdf

By your description it sounds like this is an active circuit of some kind and not a traditional shunt. One way to know if it is a shunt, it will have relatively large cables to deliver the current through the shunt and smaller sense wire terminals for the voltage sense wires.  In the case of the shunt you would have very low voltages and not what you describe.

 It sounds like you might have a torroidal transformer (shaped like a donut) acting as an inductive pickup for current flow in the larger battery chassis wire which would pass through the center of the torroid. Then maybe some kind of active sensing circuit is involved at the panel. This arrangement is usually just used for sensing on AC lines because the torroid needs some changing fields to induce voltage as a pick up.  If this is the kind of sensing arrangement that you have there would only be small wires going to the torroid and no large cable connections are involved at all. If it is a torroid and it has failed (open on one leg) you may be able to measure the remaining leg and sort out the configurtion and order one. Hope this shot in the dark helps.

Later Ed

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