Here is your parts diagram just in case you need it.
http://www.ereplacementparts.com/dewalt-dw505-type-hammer-drill-parts-c-1009_9661_2281.html
And here is the number to a factor tech which could answer your question on trigger wiring. There is no diagram available but, I'm sure a tech will get you up and going.
(702)889-6025 ask to speak to a tech.
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