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3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
Make sure you have a good contact at the grounds. To check that connection run a wire from the bolt you used as ground back to the - on the battery. If the lights are still the same then you have a good ground connection.
I would ground them back to the battery because the copper in wire is more conductive then the bolt to the chassis thus allowing more electrons to flow through faster. = more light.