I used two 6 volt relays in my conversion as well using the same schematic plan and BigKev posted. the lighting improvement is very noticable. I bought my 6 volt H4 halogen bulbs from J.C. Whitney.http://www.jcwhitney.com/jcwhitney/textsearch_result.jcw?sku=6+volt+halogen&shopid=100001&_requestid=12141790
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