2019-2020 Ford F-150 Auto Start Stop Eliminator | Left-Side Switch Harness

This switch memory harness is for the 2019–2020 Ford F-150. It stores the last stop-start setting you chose, so if you turned Auto Start-Stop off on one drive, it stays off the next time you start the engine. It plugs in between the stop-start switch and its factory connector, so the button keeps working as before.

You can still use the original button at any time. Whatever you select last is what the module repeats on the next start. Take the module out and the vehicle behaves exactly as it did from the factory.

Covered model years

The fitment table for this SKU lists the following, each marked as a 100% fitment match:

• Ford F-150: 2019–2020

For reference, the Ford F-150 in these years is a full-size pickup offered with 2.7L and 3.5L EcoBoost V6 and 5.0L V8 engines, with the 3.0L Power Stroke diesel and 3.5L PowerBoost hybrid offered on selected years. The listing is written around the thirteenth-generation (2015-2020) F-150. Trim is not listed separately. Any trim in these years with factory stop-start and the pictured connector is covered.

How Auto Start-Stop behaves from the factory

Auto Start-Stop is designed to default to on. The off switch (usually marked with an "A" inside a circular arrow) cancels it for the current drive. At the next start the system is armed again. That reset is intentional on the manufacturer's side, and it is the only behavior this module changes.

Why owners turn it off

Stop-start saves the most fuel in long idles, but plenty of drivers would rather keep the engine running. Common reasons: towing or hauling, where an engine restart under load is unwelcome; drive-thru lines and parking lots, where the engine cycles on and off every few feet; hot days, when the A/C compressor stops with the engine on many vehicles; and stop-and-go traffic where the restart delay is noticeable when pulling into a gap. On a full-size pickup, any of these can mean a button press at the start of nearly every drive.

Conditions the factory system checks

The factory system will skip an auto stop for many reasons: battery charge below its threshold, cold coolant, high climate-control load, a steep grade, the hood or driver door open, or a 4WD or tow mode on vehicles that have them. Those checks stay in control after this module is installed. It does not force stops and it does not bypass any of those safety inputs.

Keep the battery healthy

Vehicles with stop-start normally use an AGM or EFB battery sized for repeated restarts. If you replace it, use the same type and size, and follow the manufacturer's battery reset or registration step where one exists. A wrong or unregistered battery can leave the stop-start system disabled, and that has nothing to do with this module.

Before blaming the module

If a "stop-start unavailable" or similar message appears, check the battery first. A battery that tests weak, a recent battery replacement that was not registered where the manufacturer requires it, or a fault in the battery current sensor can all disable the system. Clear up those issues before judging how the module works, because it cannot hold a setting the vehicle refuses to accept.

Installing the switch memory harness

It plugs in between the stop-start switch and its factory connector, so the button keeps working as before. Because it is plug-in only, removal is the reverse: unplug the module and reconnect the factory connectors directly. Keep the original clips and trim fasteners if you remove a panel to reach the connector.

What to expect

• Leaves no permanent change after removal.
• Holds the stop-start button state between drives.
• Lets you re-enable the system with the factory button at any time.
• Leaves engine and transmission software untouched.

Fitment check

• Model year and model match a row in the table above (2019–2020 Ford F-150).
• Your Ford F-150 has the factory stop-start button. Base trims or engines without stop-start have nothing for the module to remember.
• No aftermarket remote start, alarm or gateway bypass is wired into the same circuit. If one is, email support before ordering.
• The connector at your install point matches the one in the product photos.
• The battery and charging system test good and no warning lights are on.
• If you are unsure, send your VIN to support@automotivebypass.com and we will confirm fitment.

Shipping, returns and warranty

Free standard shipping covers the contiguous US, with dispatch in 1–2 business days and 3–4 days on the road after that. You have 45 days to request a return (pre-approval required, 20% restocking fee, buyer-paid return shipping). The module is backed by a 3-year limited warranty. For order or fitment questions, write to support@automotivebypass.com between 9 and 5 Pacific, Monday through Friday.