no power locks, need to fake relay
Printed From: the12volt.com
Forum Name: Motorcycle Electronics
Forum Discription: Installing Stereos, Alarms, Remote Starters, Lights, Garage Door Openers and other electronics on motorcycles.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=95968
Printed Date: June 22, 2025 at 8:20 AM
Topic: no power locks, need to fake relay
Posted By: mikesoundz
Subject: no power locks, need to fake relay
Date Posted: July 27, 2007 at 6:59 PM
I'm installing a 2 way alarm on a motorcycle, and I need the alarm to think that it locks and unlocks "doors." I'm trying to figure it out using relays, but so far no luck. Help would be much appreciated. Right now, the alarm arms and disarms, but then false alarms after 5 seconds becuase it thinks the doors are still unlocked. But a motorcycle doesn't have doors. thanks
Replies:
Posted By: fkelsey
Date Posted: July 27, 2007 at 7:27 PM
What kind of alarm? Never seen one you had to hook the door locks up on if you did not want to. Sounds like a zone trigger.
Posted By: JWorm
Date Posted: July 27, 2007 at 8:47 PM
The alarm doesn't need to see the doors lock and unlock. It may need to see a door open and close to prevent the alarm from re-arming after a certain period of time if a door is not opened or the ignition is not turned on.
Probable causes of your false alarm....
1. Wrong ignition wire. If the alarm sees the ignition ON after arming, it may trigger. Depends on the brand.
2. Door trigger input. You may need to hook this wire up to something. Maybe a light in the instrument cluster that only turns on when you turn on the key. Maybe the output of a tilt sensor like the DEI 507T.
3. Shock sensor. Maybe it is set really sensitive and is vibrating when you arm the alarm.
Either way...since you installed a 2-way the remote should show what is triggering the alarm. If it is showing the "door" as the problem, then what did you hook that wire up to on the bike?
Posted By: mikesoundz
Date Posted: July 27, 2007 at 9:47 PM
It's an off brand alarm off ebay, but I am MECP certified and have never ran into this problem before. I tried different combinations with the door trigger; not having it hooked up and then I tried grounding it... still same problem. The weird thing on this bike that may be causing it, could be an igntion problem like you said, the ignition and the illumination (parking lights) branch are actually the same wire.
Posted By: the12volt
Date Posted: July 27, 2007 at 10:22 PM
That being the case, you'll need to isloate the parking light output of the alarm from the ignition lead going to the alarm with an SPDT relay. Cut the ignition/light lead. Connect the key side to terminal 87a. Connect the other side to terminal 30. Connect terminal 87 to 12V+. Connect the positive light flash output from the alarm to terminal 85 and connect terminal 86 to ground. Make sure you connect the alarm's ignition lead to the key side of the ignition/light lead and you should be set to go. -------------  the12volt • Support the12volt.com
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