python 574, 1995 f-150

Might want to pull out your Digital Multi Meter on this truck.  The info I have says
you might have 5 Yellow +12V constant wires and the following ignition wires :

Starter = RED / Light Blue
Ignition1 = RED / Light Green
Ignition2 = Gray / YELLOW ( thin ) for ABS
Accessory1 = Gray / YELLOW ( thick ) for heater blower motor
Accessory2 = BLACK/ Light Green for Heat / AC controls

If you want to power everything during remote start, not only will you need the
Flex Relay, but you will need another 30/40 Amp SPDT relay with fuse.

thank  you for the quick reply. i am a stereo guy not an alarm guy. i do have five yellow wires,  but my sons heat doesnt work. the a/c works though. so do i ignore the other flex relay labeled wires and tape them back? i think the only function my son wants is to start the truck and roll down the windows

Here is how your H3 harness should look :
H3/1 PINK (+) IGNITION 1 IN/OUT            RED / Light Green
H3/2 RED / WHITE  +12V INPUT (30A FUSED)                Yellow #1
H3/3 ORANGE (+) ACCESSORY OUTPUT          Gray / YELLOW ( Thick )
H3/4 VIOLET (+) STARTER OUTPUT (CAR SIDE)          RED / Light Blue  - cut engine side
H3/5 GREEN (+) STARTER INPUT (KEY SIDE) RED / Light Blue  - cut key side
H3/6 RED IGNITION 1 +12V INPUT (30A FUSED)          Yellow #2    
H3/7 PINK/WHITE (30) FLEX RELAY OUTPUT      Gray / YELLOW ( Thin )
H3/8 PINK/BLACK (87a) FLEX RELAY INPUT         Not Used
H3/9 RED / BLACK  +12V INPUT (30A FUSED)     Yellow #3
H3/10 NC No Connection

H1/1 Red +12V Input should go to Yellow #4.

That cover 4 of the 5 ignition wires.  To power thew 5th wire ( BLACK/ Light Green ), get a
30/40 Amp SPDT automotive relay with 5 Pin harness and a 30 Amp fuse with holder.
Depending on how the wire tests, you can use either of these Python wires to control
the relay.
H2/10 PINK (-) 200mA IGNITION 1 OUTPUT
H2/22 ORANGE (-) 200mA ACCESSORY OUTPUT

Wire relay as follows :
Relay Pin 85 to Python H2/22 ORANGE (-) 200mA ACCESSORY OUTPUT
Relay Pin 86 and Pin 87 to +12 Constant - Yellow #5 thru 30 Amp fuse
Relay Pin 30 to  BLACK/ Light Green
Relay Pin 87A not used - insulate

Here is a link to a similar truck.  https://www.the12volt.com/installbay/forum_posts.asp~TID~133810~PN~1
At the end is some info on the use of a relay coil quenching diode.  It is optional but could
help your expensive Python system to survive many years of trouble free use.

Thats it, all done.

Thank You so very much for the info. hope to get this fired up tomorrow.

any idea if i can get this thing to raise and lower his windows with the remote?

Windows = relays, plenty of relays....  Or the nicely packaged Directed 530T module.  

Fortunately the Python has plenty of AUX outputs, but depending on exactly what you want to do you might need a BitWriter to set the exact time / options.

Here is a link to the 530T install guide :  https://www.the12volt.com/installbay/file.asp?ID=758

starter input and output. i have one small RED / light blue at ignition switch, how do i find the key side of the wire? the one i can see is energized with key in crank position.