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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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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.


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Posted: 05/23/22 02:52pm Link  |  Quote  |  Print  |  Notify Moderator

If the negative is disconnected from the house TC batteries, no current will be flowing through the house system however, if you have hooked up the 7 pin plug, the negative wire is un switched and could complete a circuit if the key is on or switch is on completing the circuit via the truck battery. The house would be disconnected but truck power would be present. Try disconnecting the truck negative and that should cease all current flow.


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Posted: 05/23/22 05:47pm Link  |  Quote  |  Print  |  Notify Moderator

Geewizard wrote:

I'm not on shore power nor am I connected to the truck.

If I disconnect at the battery end, everything is unpowered as it should be.

I'm trying to find out if this is normal. I think it is because the negative terminal of the battery is connected to the frame ground as are the ground wires.


If you disconnect the battery, and the truck pigtail is not connected and there is no 120 v power, and you are not connected to solar, then it is normal that there is no power to any 12 volt device. If there were I would seriously wonder where the power was coming from.

The negative terminal of your battery might be connected to the frame. That is the way cars and trucks are wired. That is not the way my RV is wired. The frame is not used at all. In fact there is no metal frame, just wood. The negative wire runs to the power station. My solar is wired separately. There is a wire from the solar controller directly to the negative terminal of the battery. I also wired my NovaKool compressor refrigerator with a negative wire that bypasses the main electrical system and goes directly to the refrigerator. It was the easiest way to bump up the wire gauge.

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Posted: 05/24/22 07:49am Link  |  Quote  |  Print  |  Notify Moderator

Original post is from September, 2021.


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trail-explorer

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Posted: 05/25/22 12:49pm 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.

YEP. THis.

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