I installed my Racetronix Hotwire kit a few weeks ago and was curious if there might be better ground locations than what I used. I have the negative battery cable that came with the kit grounded to the fender. Since the cable was not very long this seemed to be the best spot. I have the ground coming off the relay bolted to car using a bolt that holds the fuel line bracket next to rear brake line bracket. Racetronix did not include any real instructions with the kit so I went with the pics they had on their website.