AMP Research assembly
One version plugs into the OBD-II port. The other means finding the door trigger wires yourself.
Both are sold as PowerSteps and both end with boards that drop when you open a door. Which one you bought decides whether this is an afternoon in the driveway or a day with a multimeter and a wiring diagram.
Powered boards mean the truck has to know a door opened
A PowerStep is a running board on a powered linkage that extends when a door opens and retracts when it closes, with LED lighting built into the board. Mechanically it bolts to the frame. Electrically it needs power, a ground, a control module and, critically, a signal telling it which door just opened. That last requirement is what makes this different from every other accessory in this category.
AMP solve it two ways. The Plug-N-Play version uses a vehicle-specific harness that connects to the OBD-II port under the dash, pulling power and signals from there, with a pass-through so the port stays usable for scan tools and programmers. No factory wiring to identify, no dash or door trim to remove, and AMP note it significantly reduces installation time.
The hard-wired route is a different job. You locate the door trigger wires in the vehicle’s own loom, pass trigger wires into the cabin through the rubber boot on the driver side firewall, and confirm with a multimeter that you are on the correct wires, which on some vehicles involves unplugging the body control module. Both approaches are perfectly sound and they are not the same afternoon, which is why AMP sell a conversion kit purely to retrofit non-plug-and-play steps into plug-and-play ones.
What it actually takes
The mechanical half is similar either way. The electrical half is where the two versions diverge.
| Model | Time | People |
|---|---|---|
| Confirming the harness matches your exact vehicleYear, model and cab. Not interchangeable. | 15 minutes | 1 |
| Mounting brackets and boards to the frameBoth versions. Boards are heavy and awkward. | 1.5 to 3 hours | 1 to 2 |
| Plug-N-Play electricalOBD-II connection, module siting, power and ground. | 30 to 60 minutes | 1 |
| Hard-wired electricalDoor triggers, firewall pass-through, multimeter. | add several hours | 1 |
| Drilling, painting and riveting linkagesDo not skip the paint. See below. | 30 to 45 minutes | 1 |
| Testing every door and the lightsBefore any trim goes back on. | 15 minutes | 1 |
If you are comparing quotes or planning a weekend, the first question is which wiring version you have. It changes the estimate more than anything else does.
What to get right, specifically
Find out which wiring version you are buying
This is the single most useful thing to establish before ordering. A Plug-N-Play kit connects through the OBD-II port with a vehicle-specific harness, which removes the hardest part of the job entirely. A non-plug-and-play kit requires locating and tapping the door trigger wires in the factory loom, routing them through the firewall, and verifying them with a multimeter. Both work. They are very different in time, tools and risk, and the price difference rarely reflects that. If you already own non-plug-and-play steps, AMP make a conversion harness specifically to bring them onto the OBD-II connection.
The harness is vehicle-specific and the wrong one can do damage
Harnesses are built around the electrical architecture of a particular make, model and year range, and they are not interchangeable. Fitting the wrong one can produce compatibility problems, error codes, or damage to the vehicle’s electrical system. Confirm the exact vehicle including cab configuration before buying, and be careful with secondhand or leftover kits, which is exactly where the wrong harness tends to come from.
Battery off first, and the fuse out during the work
Disconnect the battery before starting, and certainly before unplugging a body control module connector if your install requires it. The instructions also have you remove the fuse from the PowerStep harness while working, and reinstall it only at the end with both doors open, so the boards are in a known state when the system first powers up. Skipping either of those is how a short or an unexpected deployment turns a straightforward job into an expensive one.
Ground quality decides whether it works reliably
The power lead goes to the battery positive with the supplied fuse holder, and the ground goes to a solid metal part of the chassis with the connection point cleaned first. That cleaning step matters more than it sounds. A poor or corroded ground is the classic cause of steps that work intermittently, deploy sluggishly, or stop working entirely, and it is frustrating to diagnose later because everything looks connected. Take the extra minute to get bare, clean metal and a tight fastening.
Paint the drilled holes before you rivet
The install has you drill both upper holes in the linkage through sheet metal with a three sixteenths bit, and then apply paint to those holes before installing the rivets. This is the step people skip because it feels cosmetic and it is not. You have just made bare metal holes on the underside of a vehicle that will live in rain, road salt and spray. Paint them, let them flash off, then rivet. It costs five minutes and it is the difference between a clean install and rust bleeding out around the linkage in a few winters.
Set the board position properly and check the pinch weld
The boards want shifting forward as far as possible for clearance, and when they are positioned correctly the board end cap nests into the linkage lower mount by about half an inch. With the boards extended, step on them to seat the linkages fully, then check that the end caps do not contact the pinch weld. That last check is easy to skip and it is what stops the boards rubbing or catching on the body every time they cycle, which they will do thousands of times.
Site the control module somewhere it will survive
The module needs a location protected from water, heat and moving parts, with enough slack in the harness to reach everything without tension, and away from pinch points and heavy vibration. It is tempting to put it wherever it fits first. Under a truck, wherever it fits first is often somewhere that gets sprayed, cooked or chafed. Route the harness along factory wire paths, secure it with the supplied clips and ties, and leave nothing hanging where it can snag.
Test every door before the trim goes back
The final check is that all doors activate the step and the LED lights work when doors open and close. Do it with the panels still off, because that is when a connection is still easy to reach. If only the rear doors deploy, that points at a specific harness connection rather than a faulty module, and it is a much quicker fix found now than after everything is reassembled.
Before you order
Confirm whether the kit is Plug-N-Play or hard-wired, since that decides the shape of the whole job.
Match the harness to your exact year, model and cab configuration, and avoid mismatched secondhand harnesses.
Plan where the control module will live, protected from water, heat and moving parts.
Have a multimeter available if the install is hard-wired, along with the vehicle-specific wiring information.
Have paint ready for the drilled holes before you start riveting.
Work on a level surface with the parking brake set, and disconnect the battery before beginning.
Who this is really for
Anybody with a lifted or full-size truck who is tired of climbing into it, and particularly households where children, older passengers or anyone with limited mobility uses the vehicle. A board that appears at the right height when the door opens and tucks away when it closes solves that without the permanent ground clearance penalty of a fixed step.
The mechanical side is well within a capable owner’s reach, and AMP’s documentation is vehicle-specific and good. Plug-N-Play kits in particular are genuinely a driveway job.
The case for an installer is strongest on the hard-wired versions, where you are identifying trigger wires in a factory loom and passing wiring through a firewall, and on any vehicle where getting it wrong means error codes or electrical damage. It is also the sensible route if you would rather somebody else own the ground quality and the module placement, since those are what determine whether the system still works reliably in year three.
What an installer does
- Confirms the harness matches the exact vehicle and identifies whether the kit is plug-and-play or hard-wired.
- Disconnects the battery and works with the harness fuse removed until final testing.
- Mounts brackets and boards to the frame, sets board position and checks end cap clearance at the pinch weld.
- Drills, paints and rivets linkage holes so bare metal is protected before assembly.
- Makes a clean, tight chassis ground and fits the supplied fuse holder on the power lead.
- Sites the control module clear of water, heat, vibration and moving parts, and routes the harness on factory paths.
- Tests every door and the LED lighting before any trim is reinstalled.
Get it built by someone who has built one before.
Tell us your ZIP and what you bought. Installers near you will quote you directly, and you deal with them, not with us.
Questions people ask
What is the difference between Plug-N-Play and the standard kit?
Where the signal comes from. Plug-N-Play uses a vehicle-specific harness that connects to the OBD-II port under the dash, with a pass-through so the port stays usable, which removes the need to find factory wiring or pull trim. The standard kit requires locating the door trigger wires in the vehicle’s loom and routing wiring through the firewall. Same end result, very different job.
Can I use a harness from another vehicle?
No. Harnesses are designed around the electrical architecture of a specific make, model and year range and are not interchangeable. Using the wrong one can cause compatibility problems, error codes or damage to the vehicle’s electrical system, so confirm the exact vehicle and cab configuration before buying.
My steps work intermittently. What is the usual cause?
Most often power or ground. Check that the battery connections are tight, that the ground is on clean bare chassis metal rather than paint or corrosion, and that harness connections are fully seated. A marginal ground produces exactly this pattern: works sometimes, sluggish other times, dead occasionally.
Only my rear steps deploy. Is the module faulty?
Probably not. Rear-only deployment typically points at a specific harness connection rather than the controller. It is far easier to trace with the trim still off, which is why testing every door before reassembly is worth the few minutes.
Do I really need to paint the drilled holes?
Yes, and it is in the instructions. After drilling the linkage holes through sheet metal you apply paint before riveting. You have made bare metal openings on the underside of a vehicle that sees rain and road salt, so the paint is what stops rust starting there.
Can I still use my OBD-II port for a scan tool?
On the Plug-N-Play kits, yes. The harness includes a pass-through that provides an additional port at the connection point, so diagnostic tools, programmers and other accessories that need the port can still be used.
Installers.org is not affiliated with, endorsed by, or sponsored by AMP Research. AMP Research and PowerStep are trademarks of their owner, referred to here only to describe the installation services that independent installers on this directory provide. Confirm harness compatibility for your specific vehicle before purchase.