I have a 98 F150 XLT with power door locks that some one removed/disconnected the keyless entry.
I want to install a new alarm with keyless entry/remote start.
has anyone done this and how difficult is it. You can get some good prices on alarms off the net but to have someone install them makes it more expensive than buying from installer..

 

This will help
1998 Ford F Series Alarm, Remote Starter, Keyless Entry Wiring Information
Constant 12V+ Green/Purple or Yellow Ignition Switch Harness
Starter Red/Light Blue Ignition Switch Harness
Ignition Blue/Green or Red/Green Ignition Switch Harness
Ignition 2 Red/Black Ignition Switch Harness (Heat/AC)
Ignition 3 Black/Green Ignition Switch Harness
Accessory Gray/Yellow Ignition Switch Harness (Blower Motor)
Tach Blue/Green Multi Coil or White/Pink PCM Passenger's Firewall
Neutral Safety Wire Not Grounding OEM Switch opens Starter Circuit
Brake Switch Light Green Brake Switch
Trunk Pin n/a
Parking Lights Brown Behind Fuse Panel in Harness or Driver's Kick Panel
Head Lamp Red/Yellow (+) Light Switch
Factory Disarm Dark Green/Purple(-) Driver's Kick Panel
Door Trigger Black/Light Blue(+) In Driver's Kick in Harness
Door Lock Pink/Yellow High Driver's Dash Negative Trigger w/Keyless Entry
Door Unlock Pink/Light Green Reverse Polarity w/o Keyless Entry
Horn Wire Dark Blue (-) Steering Column
Windows Up LF=White/Black, RF=White/Yellow
Windows Down LF=Orange/White, RF=White/Yellow, LR=Gray/Orange, RR=Yellow/Black

I done one alarm install and it will be the last. It's not that bad of a job, but it is very time consuming. If you plan on soldering all your connections, it will take 4-6 hours to complete. I think it's worth dropping your vehicle off, paying a couple hundred dollars and come back when it's done.

 

I installed a code alarm on my 05 F150. I bought from www.kcautosound.com. It took me about 4 hours to install and I soldered all my connections. I went with code alarm from travis at kcautosound for 2 reasons. He prewires it for your ford f150 and includes detailed instructions with pics (a big help), the second reason is code allows you to keep your keyless entry. If you have neverdone any type wiring I would let the professional do it. When your cutting your wires it is a little nerveracking.

 

I will install countless numbers of systems even cut the bed out of a new truck.

I still have an alarm pro do my alarms