Mercury – Upper Helm Harness Dual Engine | Next Gen DTS Helm Harness | 84-8M0157215

Overview
This harness handles the upper helm on a dual-engine, dual-station DTS setup. It gives the top station its own clean connection into the system so it isn’t sharing cramped routing with the lower helm. Once it’s paired with the lower harness and the helm-to-helm extensions, both stations stay in sync without the wiring turning into a mess. It’s a simple, steady piece that keeps a two-helm layout feeling organized and easy to run.

Key Features
• Next Gen DTS Upper Harness – Built for the upper station on dual-engine rigs.
• Upper-Station Path – Moves throttle, shift, and system data cleanly from the top helm.
• OEM Connectors – Factory plugs that seat firmly and stay locked in.
• Clean Routing Layout – Helps prevent clutter behind the dash.
• Dual-Helm Integration – Works with the matching lower harness and helm-to-helm extensions.

Engine & Boat Compatibility
• Next Gen Digital Throttle and Shift
• Dual engine
• Dual-helm layouts

Performance & Practical Benefits
With the upper harness installed, control inputs at the top station feel smoother and in step with the lower helm. You don’t get the little hiccups that show up when wiring is cramped or stretched. Service work later on is easier too since the signal path through the upper station is straightforward and not buried under crossed wires. It keeps the whole dual-helm setup feeling calmer and more predictable.

Why Buy OEM
OEM harnesses last longer, resist vibration better, and fit exactly the way Mercury designed the system. The connectors lock in tight, which helps avoid random glitches or dropouts. It’s solid wiring you can count on season after season.

FAQ
Q1: How do I know this is the harness I need?
A: If your dual-engine DTS setup has two helms, this is the harness for the upper station.

Q2: What else do I need for the full install?
A: You’ll need the lower harness and the correct helm-to-helm extension harnesses.

Q3: Any calibration required?
A: No—DTS handles its own checks once everything is connected.

Q4: Any installation tips?
A: Give the harness a smooth route with gentle bends so nothing is pulled tight.

Q5: What are signs the harness may need attention?
A: Hesitant shifts, uneven throttle response, or jacket wear along the run.