BUILD SUMMARY
YOUR BUILD STARTS HERE!
EXPLORE BUILD CATEGORIESThe Obsidian Guarantee
100% Authorized Dealer
Factory-direct parts from 20+ leading brands. Full manufacturer warranties included.
Free Shipping – No Minimum
Fast, $0 shipping on every order to the lower 48. No hidden fees.
Real Fitment Verification
Text a technician before you buy. SMS ONLY: (469) 407-7538.
Flexible Payment Options
Secure financing through Affirm & Afterpay. Interest-free over $500.
AMP Research PowerStep Plug-N-Play Pass-Thru Harness | OBD-II Splitter | Ram & Toyota | SKU 76405-01A
Increments of 1
Minimum of 1
Maximum of
0Low stock
0In stock, ready to ship
Sale price
$199.99
-100%
Regular price
Regular price
$199.99
AMP Research PowerStep Plug-N-Play Pass-Thru Harness | OBD-II Splitter | Ram & Toyota | SKU 76405-01A
Sale price
$199.99
Regular price
Regular price
$199.99
Fast Shipping
Financing Available
Best Deals
Get notified by email when this product becomes available
Have a question?
Description
The AMP Research PowerStep Plug-N-Play Pass-Thru Harness (SKU 76405-01A) splits your factory OBD-II port so your AMP PowerStep, PowerStep XL, or PowerStep Xtreme controller and a second accessory — tuner, scanner, or gauge — can both stay connected at the same time. No wire splicing, no cutting, no programming. For Ram and Toyota models running an OBD-II-based AMP PowerStep Plug-N-Play system.
Confirm your fitment by your existing or planned AMP PowerStep part number, not by model year alone — available manufacturer and distributor data does not converge on a single confirmed year range for this harness.
Component Specifications
| Spec | Detail |
|---|---|
| SKU / Part Number | 76405-01A |
| Brand | AMP Research |
| Product Type | OBD-II pass-through / splitter harness |
| Function | Splits the OBD-II port between the PowerStep controller and a second accessory |
| Compatible Step Systems | AMP PowerStep, PowerStep XL, PowerStep Xtreme (OBD-II Plug-N-Play series only) |
| Installation | Plug-and-play — no wire cutting or splicing per most sources; one source notes drilling may be required, confirm before assuming a drill-free install |
| Programming Required | None |
| Weight | 0.38 lbs |
| Package Dimensions | Approximately 7.5" x 4.0" x 2.25" |
| Related SKU | 76404-01A — closely related pass-through harness, confirm exact part number needed for your application |
| Country of Origin | United States |
| Sold As | Each |
What Is and Is NOT Included
| Item | Included |
|---|---|
| OBD-II pass-through splitter harness | ✓ |
| Mounting hardware (zip ties recommended for strain relief — not always included) | ⚠️ Confirm with packaging |
| AMP PowerStep controller or step system | ✗ NOT included — this is an accessory for an existing or planned PowerStep system |
| Tuner, scanner, or gauge | ✗ NOT included — this harness only provides the open second port |
Critical Compatibility
| Configuration | Notes |
|---|---|
| Non-OBD-II AMP PowerStep kits (hardwired/magnetic door switch systems) | Does not apply — this harness is for OBD-II-based Plug-N-Play systems only |
| Competitor automatic step brands | Not guaranteed to interface — engineered specifically for AMP PowerStep connector pinout |
| Year range | Not confirmed to a precise window — confirm against your AMP PowerStep part number directly with AMP Research or before ordering |
| Drilling | One authorized source lists "drilling required" — confirm specific installation requirements for your vehicle before assuming a no-drill install |
| Simultaneous high-frequency continuous-broadcast diagnostic tools | Not independently verified — if running specialized telemetry or performance tuning equipment alongside your steps, verify compatibility directly with AMP Research |
Common Questions
Do I need this harness?
Only if your AMP PowerStep system uses the OBD-II port for its door-trigger signal and you want to keep using a second OBD-II device — a tuner, scanner, or gauge — without unplugging your steps every time. If your step system hardwires directly into the door pillars instead, you don't need this harness.
Does this fit my Ram or Toyota?
Confirm by checking what AMP PowerStep part number your step system uses, rather than relying on a specific model year. Available sourcing does not converge on one confirmed year range for this harness — different distributors list different windows.
Will this void my factory warranty?
Per AMP Research's plug-and-play design, no cutting or splicing into factory wiring is required for the core connection. Confirm specific installation steps for your vehicle, since at least one source notes drilling may be involved in mounting the harness body.
Will this work with non-AMP automatic steps?
Not guaranteed. This harness is built for the connector pinout used by AMP PowerStep, PowerStep XL, and PowerStep Xtreme controllers specifically.
The Obsidian Take
The 76405-01A is for the AMP PowerStep owner who wants to run a tuner, scanner, or gauge through the OBD-II port without disconnecting their steps every time. It's a simple, low-cost splitter — at 0.38 lbs, there's not much to the hardware itself. The real value is not losing diagnostic access after installing your steps.
The honest gap here is fitment precision. We could not converge on a single confirmed year range across AMP Research and its authorized distributors. Confirm against your specific AMP PowerStep part number — text us your VIN and current step system part number at (469) 407-7538 — rather than ordering based on a model year alone.
Non-Returnable Notice: Once connected to an active OBD-II port, this harness is non-returnable per AMP Research policy. Confirm compatibility with your existing PowerStep part number before ordering.
Manufacturer Data Disclaimer: Specifications sourced from AMP Research and authorized distributor documentation. Available sources do not agree on a precise year range for this SKU — Obsidian Forged Auto Supply recommends confirming fitment by PowerStep part number rather than vehicle year. Obsidian Forged Auto Supply is an authorized AMP Research dealer. Manufacturer specifications are subject to change without notice.
