RE: [DMCForum] Relays & current draw
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RE: [DMCForum] Relays & current draw


I believe most after market alarms activate and deactivate features based on
ignition sensing.  I looked over Toby's site and didn't see anything
specific about this.

You probably shouldn't ground the alarm itself to the parking brake as that
would cause it to function intermittently.  Meaning, when you applied the
brake, and subsequently the ground, the alarm will wake up and most react as
if they have been triggered.

If the ground through the emergency brake is not good enough for your
options then you could add a contact switch.  Either way I would talk with
Toby to make sure any modifications you do don't harm the system(s).


-----Original Message-----
From: DMCForum@xxxxxxxxxxxxxxx [mailto:DMCForum@xxxxxxxxxxxxxxx] On Behalf
Of Ryan Wright
Sent: Sunday, February 26, 2006 4:30 PM
To: DMCForum@xxxxxxxxxxxxxxx
Subject: Re: [DMCForum] Relays & current draw

On 2/26/06, timnagin <timnagin@xxxxxxxxxxxxxx> wrote:
> Just curious, what is preventing you from running the connection(s)
> to the battery itself?

I do, actually. All of my toys - alarm system, stereo equipment,
launchers, etc - run off dedicated fused connections straight back to
the battery. However, I want to prevent operation of launchers & trunk
release when the e-brake is not set, which means I have to tie into
that. The e-brake switch is simply a switch to ground - when the brake
is set, the wire is grounded.

So the easiest way to deal with this (that I know of) is to use that
ground to power the coil on a relay, which will apply (or remove)
power to the accessories in question. Quite simple, really, except for
the fact that the relay's coil is going to draw a small amount of
power any time the e-brake is set. Now, maybe my battery won't care
about a 160ma continuous draw over a period of months. Or maybe it
will kill it in a day. I don't know; that's what I'm trying to find

> My understanding is Toby built in the feature of disabling the launchers
> when the car was running or moving.

I'll have to recheck the docs that came with them. I don't remember
seeing this as an option. If I had, I probably would have used it, and
could then tie the trunk release into that circuit. But I'm fairly
certain this wasn't included in the docs.


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