Alarm/Remote Start, 1978 Ford F-250
Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=145430
Printed Date: July 14, 2025 at 6:46 PM
Topic: Alarm/Remote Start, 1978 Ford F-250
Posted By: dvdflx20
Subject: Alarm/Remote Start, 1978 Ford F-250
Date Posted: May 23, 2019 at 6:41 PM
I am doing some upgrades to my Grandpa's old F250 and plan to use it for pulling a travel trailer. Since our furkids travel with us, I am installing an alarm and remote start system. I am not planning to add an actuator to set the choke to actually start it, I just want the ability to engage the RS and remove the key when stopped for a restroom break to keep the air flowing and prevent anyone from entering the vehicle/releasing the hounds.
I worked in a RoadShop a couple decades ago, am a bit rusty...I think I have the wiring figured out, just hoped someone on here has done this as well, I would appreciate you confirming or correcting me.
Park light (+) Brown wire at light switch
Dome light supervision (-) Green/Yellow at Light switch
Tach Green at the coil
Door input (-) Green/Yellow at Light switch
Brake shutdown (+) Purple/White at ignition harness
RS
12v Yellow at ignition harness
Starter wire Red/Blue at ignition harness
I don't believe 2nd ignition or any of the other ignition outputs are needed...again let me know if I'm incorrect here.
1978 F250 Lariat, Automatic trans, regular cab LWB
Thank you in advance!
Replies:
Posted By: geepherder
Date Posted: May 23, 2019 at 7:06 PM
I can't verify any of the wiring, but if you're just going to use the pit stop function, you need the ignition wire, but can do without the starter wire (although it can be used for starter kill). As long as you have a multimeter you'll be fine.
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My ex once told me I have a perfect face for radio.
Posted By: iskidoo
Date Posted: May 25, 2019 at 12:33 AM
If you want to keep the air flowing then I would imagine you will need an accessory wire powered during remote start.
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Steve G
Posted By: dvdflx20
Date Posted: May 27, 2019 at 12:30 PM
iskidoo wrote:
If you want to keep the air flowing then I would imagine you will need an accessory wire powered during remote start.
As I was working on the wiring the same occurred to me, the orange wire coming off the ignition harness powers the harnesses from the AC/Heat selector so I connected the Pink to it to keep the air flowing during pit stop.
Posted By: iskidoo
Date Posted: May 27, 2019 at 12:50 PM
The blower may be powered by the orange accessory wire but you should also verify that the a/c compressor is staying engaged during pit stop and key removal. Some vehicles need the ignition powered for a/c to blow cold air.
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Steve G
Posted By: geepherder
Date Posted: May 27, 2019 at 1:54 PM
You need the ignition wire connected for the engine to run.
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My ex once told me I have a perfect face for radio.
Posted By: dvdflx20
Date Posted: May 27, 2019 at 2:35 PM
iskidoo wrote:
The blower may be powered by the orange accessory wire but you should also verify that the a/c compressor is staying engaged during pit stop and key removal. Some vehicles need the ignition powered for a/c to blow cold air.
I believe the compressor and blower both work off the Black Yellow, which is powered by the Orange wire (as best I can tell from wiring diagrams I have found on the ford-trucks.com forums).
I will definitely double check this before I close everything up, thank you for mentioning it!
Felix
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