Which wires give constant, ignition and ground on a 2018 Ford Focus?
On a 2018 Ford Focus, take constant power from the Purple/Red wire at the black 7-pin plug on the ignition barrel, steering column, pin 4, ignition from the Brown/Yellow wire at the black 7-pin plug on the ignition barrel, steering column, pin 1, and ground to clean, bare body metal. Meter every wire first.
Meter every wire before you tap it. Colors change with trim and build date.
OBD-II port:Under the dash, left of the columnBest power spot:Ignition barrel or OBD-II portSystem voltage:12VIgnition type:Key and push-button (this page)
Where do I get constant, ignition and ground on a 2018 Ford Focus?
Key start: one plug at the ignition barrel. Push-button: constant at the OBD-II port.
Option 1 Key start
Ignition barrel plug
Black 7-pin plug on the steering column.
Constant
Purple/Red
Black 7-pin plug on the ignition barrel, steering column, pin 412V battery feed.
Ignition
Brown/Yellow
Black 7-pin plug on the ignition barrel, steering column, pin 1Hot with the key in run.
Accessory
Purple/Green
Black 7-pin plug on the ignition barrel, steering column, pin 6Accessory.
Ground
Body ground
Bare metal under the dashNo ground wire in the key guide. Never the battery negative post.
Start is Blue/White on pin 7. Never tap it.
Option 2 Push-button
OBD-II port
Constant on pin 16.
Constant
Yellow/Red
OBD-II port, pin 1612V battery feed.
Ignition
Fuse tap
Interior fuse panelNo ignition wire in the push-button guide. Use a slot that is dead off and hot on.
Ground
Black/White
OBD-II port, pin 4Ground.
Never tap the start button wire.
Key start from Fortin's install guide for the 2016 to 2018 Focus sedan with a key (guide 58451). Push-button from Fortin's install guide for the 2016 to 2018 Focus with push-button start (guide 99071).
Where are the turn signal, reverse and light wires on a 2018 Ford Focus for advanced 360 multicam and video telematics installs?
Circuit
Wire color
Location and what it does
Left turnNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
Right turnNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
Park lightPositive +Not yet checked
Yellow/Blue (left)
Green/Orange (right)
Harness under the passenger carpetFrom the key guide. Positive parking light. Meter it first.
HeadlightNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
ReverseNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
Dome lightNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
Each chip shows the main insulation color with its stripe. Source: Fortin's install guide for the 2016 to 2018 Focus sedan with a key (guide 58451) and Fortin's install guide for the 2016 to 2018 Focus with push-button start (guide 99071).
Where are the brake, door, speed and CAN wires on a 2018 Ford Focus for advanced 360 multicam and video telematics installs?
Circuit
Wire color
Location and what it does
CAN dataDataNot yet checked
Gray/Orange (high)
Violet/Orange (low)
OBD-II port, pins 3 and 11Never cut or splice the CAN wires.
DoorsNegative -Not yet checked
Green/Purple
Harness at the driver kick panelDriver door. Meter it first.
BrakeNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
Parking brakeNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
Vehicle speedNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
Source: Fortin's install guide for the 2016 to 2018 Focus sedan with a key (guide 58451) and Fortin's install guide for the 2016 to 2018 Focus with push-button start (guide 99071). Wires marked Not found were not in the guides.
Where are the fuse boxes and ground points on a 2018 Ford Focus?
Driver dashOBD-II portPush-button constant and CAN.
Ground pointsBare body metalNever the battery negative post.
Locations from Fortin's install guides.
Where is the OBD-II port on a 2018 Ford Focus?
OBD II
Diagnostic portOBD-II port: under the dash, left of the columnPlug-in GPS trackers and OBD harnesses connect here. Check the port before you plan the install.
Which years share wiring with the 2018 Ford Focus?
This page2018Ford Focus.
Same wiring2016, 2017Fortin uses the same guides for these years.
Other years2012, 2013, 2014, 2015Different guides. Check the page for your year.
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This page covers the 2018 Ford Focus compact car with a key start or push-button start.
The wire colors come from Fortin's install guides, read wire by wire. Our own team has not yet metered these on a 2018 Focus.
Written by API Signal, fleet GPS and camera installers for 35+ years across Georgia, South Carolina and North Carolina, installing every major telematics and camera brand. Every wire on this page lists its source.
Test every wire with a meter before you tap it
No wiring information is ever guaranteed. Colors and locations change with trim, options and build date, and the manufacturer can change them in the middle of a model year. We share this as a starting point for installers, and you are responsible for confirming every connection on the vehicle in front of you.
Common questions about 2018 Ford Focus wiring
What wire is constant power on a 2018 Ford Focus?
Purple/Red at the black 7-pin plug on the ignition barrel, steering column, pin 4. 12V battery feed. Meter it before you tap it.
What wire is ignition on a 2018 Ford Focus?
Brown/Yellow at the black 7-pin plug on the ignition barrel, steering column, pin 1. Hot with the key in run. Meter it before you tap it.
Which years share wiring with the 2018 Ford Focus?
2016, 2017. Fortin uses the same guides for these years.
Help build this page
Had the panels off on one of these? Show the next installer what you found.
No one has sent photos for the 2018 Ford Focus yet, so yours could be the first. Every photo, wire color and tip we use goes on this page with your name on it, and it saves the next installer time under the dash.
1. Snap it
The plugs, tap points, fuse boxes and ground points. Phone photos are fine.
2. Send it
Tap "Add yours" at the top of this page. Your tip and your photos go in the same box.
3. See your name on it
We check every tip, then post it here "Compliments of" you, by name.
Compliments of
The installers who helped build this page.
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Founding contributor spot: openThe first installer to confirm a wire or send photos for the 2018 Ford Focus gets their name here, and it stays here.
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Every tip we use gets a creditThe wire you checked is marked "Checked on a vehicle, compliments of" you.
Want to be famous?
Your name, right on this page, for everyone who uses it to see. Add your tip and your photos in one box.
