Okay, so here's the dealio...
I got a new truck, and unfortunately, it's on the top 5 most stolen vehicles list across the nation. So, I Just bought an alarm I need to install. I've installed alarms many times, however, this part that I'm wanting to do is all new to me.
The alarm comes with starter kill, that's all fine and good for a new would be thief, fbut for a veteran, it's easy to bypass. So, I want to cut the main leads going to the FICM (Fuel Injection Control Module) and put in a cut-off switch that would be hidded. This won't allow the truck to start. It would allow it to turn over, if they were able to bypass, but never start, as the fuel injectors will not fire. I know, most of you are saying just wire up a switch to the Fuel pump...well, great...if I had a gas car. This is diesel, and cutting off the fuel for diesel is always bad, as the injectors will always try and fire. That's bad and will destroy the injectors at a cost of $300 a piece, not too mention the labor to repair.
So, The problem is with the remote start. And that is not the only problem. I want to wire the kill switch for the FICM as a "hall Effect" style by use of a magnet, that way I can hide the switch part of it way up somewhere behind the dash that can NEVER be seen, and then all I have to do is wave the magnet close to it to trigger it. Then, have it trigger a relay which latches and then start the truck and it keeps the connection (power to the FICM) until the ignition is turned off, then the latches closes again and the truck can then be rearmed.
Then, when I remote start the truck. it activates that same relay, doing the same thing as if I had waved the magnet close to the switch and so on.
But, I'm not quite sure how to go abouot it. I've been thinking about it for the last couple months while I've been saving up for the alarm. Can't quite figure it out.
I'm also wandering what happens when I remote start the truck, disarm alarm (i think it still keeps engine running, it just turns off alarm part and unlocks doors), get in, insert key, and turn to on position, that slight turn to the on position, will it mess with the latching relay and quickly turn off the FICM? That could damage it if it's done too many times or something?
Anyway, any help would be great.
I already have the hall switch figure out. It allows whatever is plugged into it, to sink to ground through a mosfet. So that isn't a problem. I just have never dealt with latching relays.
I think to bypass the remote start and FICM kill switch, i would use a diagram like one below? If so, then I just need to figure out how to build the latching relay part for the hall switch that connects to the FICM and figure out how to combine the two circuits to work together.
Thanks in advance for any help you guys can give this newb.
EDIT: Ignore where it says fuel pump relay on the diagram, that should read for the connections from the latching relays of the hall switch for the FICM