parking lights relay messing alarm

Printed From: the12volt.com
Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=28856
Printed Date: July 18, 2025 at 8:20 PM

Topic: parking lights relay messing alarm

Posted By: ravertony
Subject: parking lights relay messing alarm
Date Posted: March 22, 2004 at 5:45 PM

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
Tony

Replies:

Posted By: sparkie
Date Posted: March 23, 2004 at 8:15 PM

Hook the alarm's positive output to terminal #86 of the relay. Terminals #85 and #30 to a good ground. Terminal #87 to the negative trigger parking light wire in the car.

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sparky

Posted By: ravertony
Date Posted: March 24, 2004 at 5:25 PM

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???

thanks again
tony

Posted By: its_radio_shop
Date Posted: March 24, 2004 at 9:02 PM

Yes try a diode on the relay. It will stop the reverse voltage spike.