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ultrastart u450 basic alarm issue

Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=119188
Printed Date: July 07, 2025 at 7:38 PM


Topic: ultrastart u450 basic alarm issue

Posted By: jmacf14
Subject: ultrastart u450 basic alarm issue
Date Posted: January 08, 2010 at 8:41 PM

I installed this u450 in my brother's 200 ram 1500. I used the green wire -neg. door trigger input and soldered it to the yellow wire at the headlight switch. I tested that wire and know its good. The issue Im having is that the u450's led stays lit constant with the doors shut. it should only do this when the doors are open, or when it is in valet mode. when I open the doors with the alarm armed, it doesn't trigger the alarm. At first I thought maybe the wires were backwards in the alarm harness ( the neg input and pos input) but the the led would shut off when the door is open. this isn't the case, as the led stays on constant unless the ignition is on, or it is armed, then it flashes.

I'm stumped, anyone else come across this issue? I tried 2 differant harnesses, and brains, no luck. I'm thinking about moving away from ultrastart, as over the last 2 years the quality of the harnesses, brains, and sirens has gone to hell. Very dissapointed with them anymore. Anyway if anyone has any ideas, or suggestions I would appreciate it. Thanks.



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jmacf14



Replies:

Posted By: x1le
Date Posted: January 08, 2010 at 9:09 PM
I'm confused. Why would you connect it to the headlight switch? You either want to go directly to the door pins, or use the domelight, not the headlights...



Posted By: jmacf14
Date Posted: January 08, 2010 at 9:43 PM
The yellow wire at the headlight switch is for the dome. Sorry I should have specified that.

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jmacf14


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