Which wires give constant, ignition and ground on a 2018 Ford F-650 and F-750?
On a 2018 Ford F-650 and F-750, take constant power from the Brown/Red wire at the customer access bundle, under the driver side dash, taped near connector C212, ignition from the Yellow/Gray wire at the same bundle, 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:Location not confirmedBest power spot:Under driver side dashSystem voltage:12VEngines:6.8L gas, 6.7L diesel
Where do I get constant, ignition and ground on a 2018 Ford F-650 and F-750?
Ford builds customer access wiring into every F-650 and F-750 for upfitters. Use it instead of tapping the truck's own wiring.
Option 1 Easiest
Customer access bundle
Blunt-cut, taped wires under the driver side dash, near connector C212.
Constant
Brown/Red
Customer access bundle, under the driver side dash, taped near connector C212Battery feed for an electric trailer brake controller, BJB fuse 22, 30A, hot at all times.
Ignition
Yellow/Gray
Same bundleHot in run and start, fuse 35, 10A. Ford calls it the customer access ignition circuit.
Ground
New ground
Clean cab metal or a factory groundFord's customer access bundle has no ground wire. Make a clean ground to bare metal.
The same bundle has vehicle speed (Violet/Orange), park brake (White/Violet), brake add-on (Blue/Orange) and park-only (Gray/Brown).
Option 2 Lamps at the rear
Rear body builder connector
At the end of the frame or back of the cab, left frame rail, depending on options.
Park light
Brown
Rear body builder connectorTrailer tow park lamp output.
Ground
White
Rear body builder connectorTrailer tow return (ground).
Ford's lamp outputs are trailer tow relay outputs. Use them as sense inputs only.
Colors from Ford's 2018 Body Builders Layout Book. Meter every wire before you tap it.
Where are the turn signal, reverse and light wires on a 2018 Ford F-650 and F-750 for advanced 360 multicam and video telematics installs?
Circuit
Wire color
Location and what it does
Left turnPositive +Not yet checked
Yellow
Rear body builder connector C416, pin 5Trailer tow left turn.
Right turnPositive +Not yet checked
Green
Rear body builder connector C416, pin 2Trailer tow right turn.
ReversePositive +Not yet checked
Brown/Blue
Rear body builder connector C416, pin 9Reverse lamp output.
BrakePositive +Not yet checked
Violet/White
Rear body builder connector C416, pin 4Stop lamp output.
Brake add-onPositive +Not yet checked
Blue/Orange
Customer access bundle, under the driver side dashFord's blunt-cut circuit for adding loads to the brake pedal switch, 5A.
HeadlightNot foundNot yet checked
Not found
Not foundNot in Ford's customer access circuits.
Each chip shows the main insulation color with its stripe. Source: Ford's 2018 Body Builders Layout Book.
Where are the brake, door, speed and CAN wires on a 2018 Ford F-650 and F-750 for advanced 360 multicam and video telematics installs?
Circuit
Wire color
Location and what it does
Park brakePolarity: meter itNot yet checked
White/Violet
Customer access bundle, under the driver side dashPark brake signal, blunt cut. Meter set and released.
Vehicle speedAC signalNot yet checked
Violet/Orange
Customer access bundle, under the driver side dashVehicle speed out from the PCM.
Park onlyNegative -Not yet checked
Gray/Brown
Customer access bundle, under the driver side dashPCM output, pulled to ground when the transmission is in park (160mA max).
DoorsNot foundNot yet checked
Not found
Not foundNot in Ford's customer access circuits.
CAN busNot foundNot yet checked
Not found
Not foundNot in Ford's customer access circuits.
Sources: Ford's F-650 / F-750 Body Builders Layout Books for 2016, 2018, 2019 and 2021 to 2027 (OEM). Headlight, door and CAN wires are not part of Ford's customer access circuits. No book was found for 2017 or 2020.
Where are the fuse boxes and ground points on a 2018 Ford F-650 and F-750?
Under the hoodBattery Junction BoxFuse 22 (30A) feeds the Brown/Red trailer brake constant; fuse 35 (10A) feeds the Yellow/Gray ignition.
Ground pointsClean metalFord lists no ground wire with the cab customer access circuits. Ground to bare cab or chassis metal, never a painted surface.
RearTrailer tow returnThe rear body builder connector carries Ford's trailer tow return ground for rear equipment.
Fuses from Ford's 2018 Body Builders Layout Book. Our team has not yet checked them on a truck.
Where is the OBD-II port on a 2018 Ford F-650 and F-750?
OBD II
Diagnostic portOBD-II port: location not confirmedLook under the driver side dash first, and send us a photo if you find it.
Which years share wiring with the 2018 Ford F-650 and F-750?
This page2018Ford's 2018 book.
Same layout2016, 2017, 2019Same customer access bundle and rear connector.
Not this page2021 and newerFord moved the upfitter wiring to an underhood connector. No book was found for 2020.
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This page covers the 2018 Ford F-650 and F-750 medium duty truck. Ford builds customer access wiring into these trucks for body builders, so a GPS or camera can take power and signals without cutting into the truck's own harness.
Every color here comes from Ford's 2018 Body Builders Layout Book, which matches 2016. Our own team has not yet metered these on a 2018 truck, and each row says so.
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 truck in front of you.
Common questions about 2018 Ford F-650 and F-750 wiring
What wire is constant power on a 2018 Ford F-650 and F-750?
Brown/Red at the customer access bundle, under the driver side dash, taped near connector C212. Battery feed for an electric trailer brake controller, BJB fuse 22, 30A, hot at all times. Meter it before you tap it.
What wire is ignition on a 2018 Ford F-650 and F-750?
Yellow/Gray at the same bundle. Hot in run and start, fuse 35, 10A. Meter it before you tap it.
Where is the reverse wire on a 2018 Ford F-650 and F-750?
Brown/Blue (positive +) at the rear body builder connector C416, pin 9. Reverse lamp output. Meter it before you tap it.
Where is the brake wire on a 2018 Ford F-650 and F-750?
Violet/White (positive +) at the rear body builder connector C416, pin 4. Stop lamp output. Meter it before you tap it.
Where is the vehicle speed signal on a 2018 Ford F-650 and F-750?
Violet/Orange at the customer access bundle, under the driver side dash. Vehicle speed out from the PCM. Meter it before you tap it.
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No one has sent photos for the 2018 Ford F-650 and F-750 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.
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The plugs, tap points, fuse boxes and ground points. Phone photos are fine.
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Tap "Add yours" at the top of this page. Your tip and your photos go in the same box.
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