Is it ok to use aluminum for a busbar, or power distribution block?

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I have 2 LED light bars mounted on my grille guard ( 24 inch each ).
I have 2 48 watt LED backup lights on my rear bumper ( great for tailgaters ).
I ran everything thru 2 relays so I'd only have to run a small 3 conductor signal wire to switches in the cab.
These blocks are made of plastic so insulating is not a problem, mount anywhere.
Also links can be added ( see photo ) to make a buss.

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Also..... It wasn't that long ago they used aluminum wire in residential. My only issue with your setup would be the fireworks if it grounded out.
 
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