parking lights relay messing alarm

I have a Celica GTS 2002 and im having an annoying problem with my parking lights relay and alarm.  My alarm comes with a built in relay for the parking lights, but the output is a Positive 7A and on my vehicle the parking lights wire needs to be grounded in order for the lights to come on.  I used the reverse polarity relay setup on this website and the lights do flash when i arm the alarm, but after they flash the alarm makes error beeps (it does it when there's an electrical error or master reset).  Im guessing its causing a peak in power because of the high output from the internal relay in the alarm.  I dont know much about relays but can someone help, i looked around on the website but cant seem to find info on this.

Thanks for the info sparkie, but like I posted above I did convert the polarity with a relay already (what your giving me), but my problem is that it makes my alarm get errors.  Im guessing its causing a peak in power or some sort of reverse voltage and i started reading this other thread were they are talking about diodes with relay is that what i should do???