Since the stock 04 Alarm LED flashes off of a pulsed ground and most aftermarket systems use a positive pulse, would it just be a matter of putting a relay in?

I assume I would use a SPST relay and have it switching the ground correct?

 

Your terminology is a bit skewed, and you haven't said what it is you wish to accomplish, so helping is going to be difficult. Most alarm LEDs are controlled directly by a pin on the processor, rather than a relay, as most processors these days can source/sink 20-25mA (LED is probably run at 10-15mA).

For future reference, though, there's no such thing as a pulsed ground, or switching the ground. I believe what you are trying to say is the output is normally at ground level, and a momentary positive pulse is what activates some object (like the LED). If you want to shorten the description, try "a normally low output".

 

Sorry, I should have been specific. I am thinking of installing a Hornet 700T and want to be able to use the Stock Alarm LED. From other threads I have read here (sorry, search isn't working right now so I can't quote it) people have claimed that the stock LED is given a 12V constant at the Dash. So I just assumed that meant it didn't light because it wasn't grounded. My thought was that the OEM alarm just cut the ground in and out to make it flash.

Maybe I am just unfamiliar with how LEDs work. But if all it needs is to be grounded (which I believe is something others have tried and it does turn on) that I would hook the ouput of the 700T into a relay. Then I would connect the ground from the stock led to the other side of the relay which would then be connected to a ground. That way when the 700T sent power it would connect the stock led to the ground, and when it wasn't sending power it wouldn't.

Chris

 

If the info you've given is correct (+12V supplied to the LED all of the time), then your assessment is correct. Attaching a relay between the LED and ground would allow you to control it.

 

you might want to check the spec. for how much amperage the LED output can push.

generally, an LED output on the alarm system will not have enough power to run a relay. IF you attach a relay to a LED output, you risk burning out the LED output.