There have been at-least two previous posts about this topic and AFAIK no-one has fully investigated how to do this. My preliminary research showed that there was indeed, a relay in the system that could be bypassed but I wasn't interested in the mod so I went no further.
Going through my bookmarks I found this guy: http://www.kptechnologies.com
Supposedly the products are the cat's meow. IIRC a friend had one of their pieces and was happy with the results of whatever it was he wanted. Anyways, a foglight product is shown there and it would appear to be a solder in affair. And there is a support forum to ask questions.