Pickup and chassis cab. Gas and Cummins diesel. Key or push-button start.
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Which wires give constant, ignition and ground on a 2015 Ram 2500 / 3500?
On a 2015 Ram 2500 / 3500, take constant power from the Red wire at the BCM under the driver dash, black 4-pin plug (B), pin 3, ignition from the Pink/White wire at the BCM black 48-pin plug (E), pin 27, and ground to clean, bare body metal. Meter every wire first.
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.
This page covers the 2015 Ram 2500 / 3500 pickup and 3500 / 4500 / 5500 chassis cab. The body control module (BCM) under the driver dash has constant, ignition, accessory and most signal wires, laid out like the Ram 1500.
The colors come from the 2013 to 2016 sheet, and Ram's 2015 upfitter schematic gives the upfitter feeds. Our own team has not yet metered these on a 2015 truck, and each row says so.
OBD-II portUnder the driver dash
Best power spotBCM, driver dash
System voltage12V
Ignition typeKey or push-button
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Where do I get constant, ignition and ground on a 2015 Ram 2500 / 3500?
Take constant, ignition and ground from the same area. On 2013 and newer trucks the body control module (BCM) under the driver dash has constant, ignition and accessory on its lettered plugs, the same as the Ram 1500.
Option 1 Easiest
At the BCM
Body control module, under the driver side of the dash. The plugs are lettered A to G.
Constant
Red
BCM under the driver dash, black 4-pin plug (B), pin 3Always hot, 40A. From an aftermarket wire sheet posted for a 2014 Ram 2500 on the12volt (reposted as covering 2013 to 2016).
Ignition
Pink/White
BCM black 48-pin plug (E), pin 27Hot in run and start. A 2016 and a 2018 2500 thread give the same wire.
Ground
Body ground
Body metal under the driver dashClean, bare metal only. Never the battery negative post.
Accessory
Brown/Orange
BCM black 48-pin plug (E), pin 36Hot in accessory and run.
A second ignition is Brown on plug A, pin 18. The starter is Light Blue/Tan on plug A, pin 19. Never tap the starter.
Option 2 Trailer connector
Trailer tow connector
Gray connector right of the steering column, on trucks with the trailer tow package.
Constant
Not on this plug
Use the BCM (Option 1)No constant is listed on the trailer connector.
Ignition
Pink/Green
Gray trailer tow connector right of the steering column, 10-pin, pin 10 (pin 2 on the 4-pin version)Ignition feed. The iDatalink guide for 2013 to 2018 trucks and a 2018 2500 thread agree.
Ground
Body ground
Body metal under the driver dashClean, bare metal only.
On 2016 key-start trucks one installer lists Violet/Brown at the ignition node, pin 4, as ignition. On the Ram 1500 that wire is a coded key-position signal, so do not use it for ignition.
Power wires from an aftermarket wire sheet posted for a 2014 Ram 2500 on the12volt (reposted as covering 2013 to 2016) (fetched three times), with 2016 and 2018 Ram 2500 threads and the iDatalink guide agreeing on ignition.
What are the turn signal, reverse and light wires on a 2015 Ram 2500 / 3500?
Circuit
Wire color
Location and what it does
Left turnPositive +Not yet checked
White/Light Green (front)
BCM white 24-pin plug (D), pin 14Flashes with the left signal. Ram's snowplow hookup sheet (OEM) gives the same driver front turn color. The rear turn wire side is unclear in our sheet.
Right turnPositive +Not yet checked
White/Tan (front)
BCM black 24-pin plug (A), pin 13Flashes with the right signal. Ram's snowplow sheet gives the same passenger front turn color.
Park lightPolarity: meter itNot yet checked
White/Brown (left front)
White/Orange (right front)
BCM plug A, pin 4 (left); plug D, pin 3 (right). Switch input: White/Brown at the park light switch, black 10-pin, pin 1The switch input is a multiplexed signal that needs about a 1k ohm load. Ram's snowplow sheet lists White/Yellow and White/Gray at the headlamps, so meter it.
HeadlightNot foundNot yet checked
Not found
Not foundWe found no headlight wire for 2013 to 2018.
ReversePositive +Not yet checked
White/Tan
BCM white 48-pin plug (F), pin 41Hot in reverse. White/Tan is also the right front turn, so go by plug and pin.
Dome lightPositive +Not yet checked
Yellow/Violet
BCM blue 24-pin plug (G), pin 14Dome supervision output.
Each chip shows the main insulation color with its stripe. Source: 2013 to 2016 sheet on the12volt, with front turns confirmed by Ram's snowplow hookup sheet.
Where are the brake, door, speed and CAN wires on a 2015 Ram 2500 / 3500?
Circuit
Wire color
Location and what it does
BrakePositive +Not yet checked
Dark Green/White
BCM white 24-pin plug (D), pin 18Hot with the pedal pressed. The sheet uses the same color for the parking brake and horn on other pins, so meter it.
DoorsNegative -Not yet checked
Violet
Violet/White
Violet/Gray
Violet/Yellow
BCM white 48-pin (F), pin 9; on a 2013 chassis cab also pin 23 (Violet/White), blue 24-pin pin 18 (Violet/Gray) and black 48-pin pin 5 (Violet/Yellow)Door triggers.
Lock / unlockNegative -Not yet checked
Purple/Light Green
Passenger door module, black 10-pin plug, pin 4One wire, by resistance. Never just ground it.
Parking brakeNegative -Not yet checked
Dark Green/White
BCM black 48-pin plug (E), pin 11Grounds with the parking brake set. Same color as the brake; go by pin.
TachAC signalNot yet checked
Dark Blue/Gray (Cummins)
Brown with stripe (gas)
Cummins: camshaft position sensor 3-pin, pin 3 (one repost says pin 2). Gas: any fuel injectorEngine speed signal. Meter the cam sensor pin.
Vehicle speedNot foundNot yet checked
Not found
Not foundWe found no speed wire for 2013 to 2018.
Upfitter feedsPositive +Not yet checked
Red/White (battery)
Pink/Orange (ignition run)
Under-dash upfitter connectors near the parking brake and steering column (trucks built with Ram's upfitter provisions)Battery feed A500 and ignition run feed F606 from Ram's 2015 upfitter schematic. Aux switch outputs AUX1 to AUX5 are Pink/White, Pink/Red, Pink/Dark Green, Pink/Tan and Pink/Violet at the underhood aux fuse box.
Sources: an aftermarket wire sheet posted for a 2014 Ram 2500 on the12volt (reposted as 2013 to 2016), 2013 chassis cab, 2016 and 2018 Ram 2500 threads, the iDatalink guide for 2013 to 2018 trucks, and Ram's body builder guide (snowplow hookup sheet and upfitter schematics, OEM). Headlight, rear turn side and vehicle speed were not found for 2013 to 2018.
Which years share wiring with the 2015 Ram 2500 / 3500?
This page20152013 to 2016 sheet plus Ram upfitter schematic.
Same wiring2013, 2014, 2016, 2017 and 2018The 2014 sheet was reposted as covering 2013 to 2016, and 2016 and 2018 threads and the iDatalink 2013 to 2018 guide agree on ignition. 2017 has no year-specific sheet.
Not this page2012 and older, 2019 and newerThe 2010 to 2012 trucks use the TIPM layout and have their own pages. The 2019 and newer trucks are a new generation.
Where are the fuse boxes and ground points on a 2015 Ram 2500 / 3500?
Under the hoodTIPMThe totally integrated power module in the driver front of the engine bay holds the fuses and relays. We did not find a fuse map we trust; check the lid.
UpfitterAux fuse box and feedsRam's 2015 upfitter schematic lists fused aux feeds: Red/Yellow and Red/Dark Blue at 40A, Red/Violet and Red/Dark Green at 25A, Red/Pink at 20A, with 133A total continuous and a 50A ground limit.
Ground pointsClean body metalWe did not find a published ground point for devices. Use clean, bare body metal, never the battery negative post.
Our team has not yet checked the fuse boxes on a truck.
Where is the OBD-II port on a 2015 Ram 2500 / 3500?
OBD II
Diagnostic portOBD-II port: under the driver dashPlug-in GPS trackers and OBD harnesses connect here. Check the port before you plan the install.
Common questions about 2015 Ram 2500 / 3500 wiring
What wire is constant power on a 2015 Ram 2500 / 3500?
Red at the BCM under the driver dash, black 4-pin plug (B), pin 3. Always hot, 40A. Meter it before you tap it.
What wire is ignition on a 2015 Ram 2500 / 3500?
Pink/White at the BCM black 48-pin plug (E), pin 27. Hot in run and start. Meter it before you tap it.
Where is the reverse wire on a 2015 Ram 2500 / 3500?
White/Tan (positive +) at the BCM white 48-pin plug (F), pin 41. Hot in reverse. Meter it before you tap it.
Where is the brake wire on a 2015 Ram 2500 / 3500?
Dark Green/White (positive +) at the BCM white 24-pin plug (D), pin 18. Hot with the pedal pressed. Meter it before you tap it.
Where is the parking brake wire on a 2015 Ram 2500 / 3500?
Dark Green/White (negative -) at the BCM black 48-pin plug (E), pin 11. Grounds with the parking brake set. Meter it before you tap it.
Which years share wiring with the 2015 Ram 2500 / 3500?
2013, 2014, 2016, 2017 and 2018. The 2014 sheet was reposted as covering 2013 to 2016, and 2016 and 2018 threads and the iDatalink 2013 to 2018 guide agree on ignition.
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