The locks on these trucks (except RKE trucks) are what the after market calls a type A system, what that means is BOTH wires on the lock motor rest at ground through the switches, this requires two relays to break the ground connection and reverse the polarity to the lock motor.

RKE trucks already have the relays built into the RKE module and all you need to do is pulse the lock or unlock wires to work.

As for remote start units, they are all generally the same, DEI pretty much makes all of them, they keep buying everyone out. My experience with remote start is a bit dated ( over 10 years ago when I was installing them) I wouldn’t spend the money on fancy ones with lcd remote screens, 1 mile range, etc. One way remotes work the best for responding the first time you push the button, two way remotes with just led lights work fairly well and battery life is alright (about a year) but be prepared for it to scream at you randomly when your beside the vechile and it can’t receive a signal..... two way with lcd works ok, has the same issue as above but battery life sucks (2-3 month life), rechargeable ones run about a month before needing recharge and the remotes for two ways are over $100+ if you loose or break it.1 mike range is BS, maybe if you lived in an Amish community in an open straight line field you mite get 1 mile.

I use viper for my vechiles, 4204v is around $100 and comes with two remotes, they also support 2 vechile operation from one remote so if you put a unit in your vechile and your wife’s car you only need one remote. Anyways I think I rambled on enough for now lol

These trucks are very easy to install a remote start on, every wire but the hood switch is in the cab and around the column/ instrument cluster besides the door lock wires.

You Tube

No, in that video he is converting the negative output of the remote start to a positive output.

This picture is how you would do it, this only works in the passenger door though

You grab the main wires from the ignition switch harness, that gives you constant power, ignition, accessory and starter. Then you can grab tach from the instrument cluster, park lights from the light switch and ground in the drivers side kick panel. (Don’t ground to the column is not the greatest ground source)

Thats the main wires wires for remote start, if installing into a standard trans truck then you got to also hookup e-brake(instrument cluster) and dome light and grab the starter wire at the clutch switch.

They dont make plug in harnesses for these trucks, as nice as it would be if they did make a harness it would probably be fairly expensive.

I don’t understand why your co-worker would say the positive wire doesn’t supply enough current when it’s powering the locks through the switch just fine. The relay coils draw very little current and the door lock power wire has a 10 or 20 amp circuit breaker on it so 30/40 amp relays will work. You just need to use standard Bosch style relays for the door locks, there cheap and easy to find everywhere.