Going to need some more info to assist you. In the mean time I have uploaded the Avital 3100 L Install Guide to the Downloads Section. It is not the 3100 XL install guide but should be close. Here is a link : https://www.the12volt.com/installbay/file.asp?ID=1334
A couple of ideas. You mentioned adding door actuators. Does that mean your truck did not come from the factory with power locks? Usually adding power locks to a vehicle includes a kit with a power lock controller. If that is the case, it will simplify the Avital 3100 install. If it was just the lock solenoids and mechanical connection to the vehicle inside the door, with 2 or 5 wires hanging free, you will need more parts and time to do the install.
My suggestion would be to start a new thread in the Car Security and Convenience Section. Include all the info about your truck, ie :
1999 Chevrolet Silverado 2 door with no factory power locks or factory alarm. After-market door lock solenoids installed, both 2 wire with no controller. Looking to install an Avital 3100 XL alarm system. I love to solder and have to tools and know how to take the lower dash panel off. Here is a link to the Avital Alarm system xxx and here is a link to the Pictorial I'm going to use as a reference, etc, etc, etc Here is the pin out for the Avital 3100 and my proposed vehicle connection points :
H1/1 ORANGE (-) 500 mA GROUND-WHEN-ARMED OUTPUT
H1/2 WHITE (+/-) SELECTABLE LIGHT FLASH OUTPUT
H1/3 WHITE/ BLUE (-) 200 mA CHANNEL 3 VALIDITY OUTPUT
H1/4 BLACK/ WHITE (-) 200 mA INTERIOR LIGHT ILLUMINATION OUTPUT
H1/5 GREEN (-) DOOR TRIGGER INPUT, ZONE 3
H1/6 BLUE (-) MULTIPLEX TRIGGER INPUT, ZONE 1
H1/7 VIOLET (+) DOOR TRIGGER INPUT, ZONE 3
H1/8 BLACK (-) CHASSIS GROUND INPUT
H1/9 YELLOW (+) IGNITION INPUT, ZONE 5
H1/10 BROWN (+) SIREN OUTPUT
H1/11 RED (+)12V CONSTANT POWER INPUT
H1/12 RED / WHITE (-) 200 mA CHANNEL 2 VALIDITY OUTPUT
H2/1 GREEN (-) LOCK, (+) UNLOCK OUTPUT
H2/2
H2/3 BLUE (+) LOCK, (-) UNLOCK OUTPUT
H3/1 Black Starter In
H3/2 Black Starter Out
That should start the ball rolling.
Soldering is fun!