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 > 12V wiring Aluminum Cargo Trailer conversion

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djglover7

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Posted: 07/09/20 08:01am Link  |  Quote  |  Print  |  Notify Moderator

All,

I have added a ground link (10AWG) from the AC ground bus to the chassis.

But, before I made the connection, I wanted to test whether or not the 12VDC positive would close the circuit to chassis ground. My assumption was NO as I have not seen any AC grounds to the chassis.

(Note: this is a DIY toy hauler that I purchased and I inherited all the undocumented work.)

When I did the test with a simple 12VDC circuit tester, I showed a complete circuit (i.e. light came on). So, somewhere, one of the receptacles is grounded or one of the appliances is grounded to chassis. (I also assume that if a bare grounding were to touch the chassis, no issue).

I think I am safe now and I can continue with locating the mystery grounding points.

[image]


2500 HD Silverado
2000 Bloomer LQ
1958 DW

djglover7

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Posted: 07/09/20 08:46am Link  |  Quote  |  Print  |  Notify Moderator

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3 tons

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Posted: 07/09/20 11:02am Link  |  Quote  |  Print  |  Notify Moderator

djglover7 wrote:

All,
My one unresolved issue is:

*IF* I bond/connect 12VDC negative to chassis *AND 120VAC ground to chassis, is there *ANY* issue with voltage surges/spikes/daemons going from AC to DC?

The big concern is surges/spikes/daemons going from AC to the tow vehicle (DC).

Please advise.


Answer: No, this is common accepted practice...

3 tons

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Posted: 07/09/20 11:07am Link  |  Quote  |  Print  |  Notify Moderator

I would note that AFAIK, within the main, household copper wire is commonly attached to aluminum lugs harboring steel screws...

djglover7

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Posted: 07/09/20 11:16am Link  |  Quote  |  Print  |  Notify Moderator

Thank you 3tons.

"I would note that AFAIK, within the main, household copper wire is commonly attached to aluminum lugs harboring steel screws...".

That appears to be true for the neutral bus bar.
The ground buss bar is steel/steel.

[image]

djglover7

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Posted: 07/09/20 11:21am Link  |  Quote  |  Print  |  Notify Moderator

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3 tons

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Posted: 07/09/20 01:36pm Link  |  Quote  |  Print  |  Notify Moderator

djglover7 wrote:

Thank you 3tons.

"I would note that AFAIK, within the main, household copper wire is commonly attached to aluminum lugs harboring steel screws...".

That appears to be true for the neutral bus bar.
The ground buss bar is steel/steel.

[image]


Are we talking metallurgical compatibility, conductivity, or maybe something else - I’m somehow missing your point?... I’m of the ‘KISS’ persuasion - I’ve often seen aluminum wire and copper wire and steel components co-mingled within the same Main...BTW, your aluminum chassis is a far better conductor than steel, yet steel is commonly employed as an effective ground return in all vehicles...You’ll be fine so long asyou apply a small dose of De-Ox...

djglover7

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Posted: 07/10/20 06:25pm Link  |  Quote  |  Print  |  Notify Moderator

I was responding to *your* post.

3 tons

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Posted: 07/12/20 08:51am Link  |  Quote  |  Print  |  Notify Moderator

djglover7 wrote:

I was responding to *your* post.


Thanks for the clarity, sorry for my poor re-read (dummy me - lol), I was only running on 7 dang cylinders...

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