bcm vs ignition harness

I'm wondering is it possible on some vehicles for the there to be an additional wire that test positive for ignition and starter circuits at the body control module(bcm)? I recently installed an alarm on a 2005 Pontiac Grand Prix and I noticed it previously had an alarm installed because the last installer left all his t-taps on the corresponding wires necessary for an alarm connection. I don't remember the wire colors but I tested and confirmed ignition AND starter wires at the bcm. I looked at the ignition harness only to see those wires untouched which made the job look a little cleaner. Can anyone add any insight into this, please.

Yes it is very possible that the wires run right from/to the BCM from the ignition switch. That 05 Grand Prix is one that it's easier to catch the wires on the left of the column/dash/at the BCM than at the ignition switch. The problem is, that just because a wire at the BCM behaves as ignition it does not mean it is the correct ignition wire. On some vehicles, if you try to power ignition/accessory/etc wires at the BCM you could cause damage to the vehicle. Safest way is to go to the ignition switch.Installer, IT support, and FFL. I need less hobbies.

Okay, thanks for the reply and info. Most basic alarms won't send power to the ignition/starter wires, just used as an immobilizer, correct? That would only apply when installing a remote start?

Just a silly thought re: the first post; T-taps and installer don't go together too well. On a more professional level that rule doesn't apply to all cars, it's also simply a point of convenience.

What's the professional, industry standard way of making wire connections Howie? Solder?

Of course with NO. with no exceptions. See the posts in the general discussion section.

Sorry about the typo, doing it on my phone whilst watching TV! Not clever. In brief, yes with no exceptions.

What kind of solder(size & type) is typical for electrical conncetions in wiring an alarm, remote start, remote windows, etc.?

typo....connections*.....sorry

I use a military splice on all wires except data connections and underhood connections. Saves a ton of time on soldering and eliminates any "bad" soldering. Plus it can be a PITA when trying to reach wires and are trying to solder in a small space.