SESH VW ALH Swap Harness
Not all swap harnesses are created equal.
Our SESH VW ALH swap harness is designed to make your engine swap simpler, cleaner, and more reliable—without the hassle of sending in a core. Just order, and we ship you a brand-new, ready-to-install harness.
With over 20 years of engine swap and wiring experience, we’ve refined this harness to run your ALH engine as close to factory OEM specification as possible, while still offering the flexibility required for custom applications.
Why This Harness Stands Out
- No core required – receive a freshly built harness, ready to install
- OEM-style automatic glow plug control – no manual toggle switches like other brands
- Integrated fuse and relay system – no external fuse box needed
- Extended harness length – 2 feet longer than OEM for easier routing across multiple VW chassis
- Cabin-mount ECU compatibility for most swap applications
- Built for reliability, cleanliness, and long-term serviceability
If this harness makes your life easier—don’t worry, that’s the point.
Engineered for Real-World Swaps
This harness allows you to install a VW ALH engine into virtually any chassis—Honda, Toyota, Rabbit, Scirocco, track cars, off-road rigs, and more. Fabrication is still required for engine mounting, but we’ve eliminated the wiring complexity.
⚠️ This is not a standalone ECU harness.
It is designed to work with your factory VW ECU.
Key Features
- Integrated MAF sensor connection
- MAF, MAP sensor, and N75 valve incorporated into the engine-side harness and extended for flexible installation
- MAF and rear knock sensor leads relocated to the engine side (unlike OEM harnesses that place them near the ECU), making routing and tucking significantly easier
- ECU-controlled OEM-style fuel pump relay for proper function and safety
- Fused battery leads for protection in the event of component failure
- Built-in OBD diagnostic connector
- OEM connectors throughout for plug-and-play reliability
Simple Startup Wiring
Only five leads are required to get your engine running:
- Power
- Ground
- Fuel pump positive lead
- Switched 12V “ignition on” trigger
- Starter signal lead
(OBD2 – ABA motors only)
What’s Included
- Complete ALH wiring harness
- Glow plug bridge
- Glow plug relay
- Flying-lead accessory harness
Important Notes
-
ECU immobilizer defeat is required.
We offer a mail-in immobilizer delete service for $100 plus return shipping. - Recommended ECUs: 2003+ models with proper glow plug control
- Pre-2003 ALH ECUs can be used, but glow plug functionality will not operate correctly
Clean. Dependable. Purpose-built.
This is the ALH swap harness you’ve been waiting for.
