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Posted: 09/09/21 03:27pm Link  |  Quote  |  Print  |  Notify Moderator

May be getting feeds from truck pigtail, AC converter or solar controller even with battery disconnected. I found some items don't run through the panel and have a direct line to DC with an in-line fuse.


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Fisherman

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Posted: 09/09/21 04:54pm Link  |  Quote  |  Print  |  Notify Moderator

What BB TX said, the black, - cable from the battery is also attached to the frame and any items like lights, etc may be grounded to the frame.

BB_TX

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Posted: 09/09/21 07:28pm Link  |  Quote  |  Print  |  Notify Moderator

Fisherman wrote:

What BB TX said, the black, - cable from the battery is also attached to the frame and any items like lights, etc may be grounded to the frame.

It is also possible the ground wire from the load center actually attaches to the frame somewhere, not the battery. And the battery cable attaches only to the frame. The frame is ground.

Again the question is; have you traced the ground wire from both ends?

enblethen

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Posted: 09/09/21 07:50pm Link  |  Quote  |  Print  |  Notify Moderator

A ground wire from the shore power cable into the 120 volt load center should be attached to the frame and to the ground wire to the receptacles.
When using batteries and disconnect the negative cable from the battery, there is no path to power 12 volt devices.


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Geewizard

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Posted: 09/10/21 07:09am Link  |  Quote  |  Print  |  Notify Moderator

Yes, I have traced the negative battery wire from both ends and it runs directly from the battery to the load center. And yes, I do know and understand that the frame is ground. I don't find any bare ground wires inside the load center attached to the negative battery wire. They are separate.

This isn't a real big deal but more of a question of why the bare ground wires, which are bonded to the frame, are carrying a load at all.


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cewillis

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Posted: 09/10/21 09:02am Link  |  Quote  |  Print  |  Notify Moderator

Geewizard wrote:

I think it is because the negative terminal of the battery is connected to the frame ground as are the ground wires.

This seems right to me - distributed ground, not single point. Probably common practice. The only (and better) way is to have ALL the ground connections wired to a single point.


Cal


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