Mercury – Inner Helm Extension Harness | 50-Foot Extension | 84-8M0173574 Mercury-250HP-Verado-6-CYL-2021 Not for use with cylinder

Not for use with cylinder or helms ending in -3 suffix

Q4: How do I get the old one off if it’s stuck

0L MPI MerCruiser from 2008 or later

Size - 4 7/8" x 2 1/2" x 2 3/4"

the fit is snug and secure — no rattling

Mercury – Inner Helm Extension Harness | 50-Foot Extension | 84-8M0173574 Mercury-250HP-Verado-6-CYL-2021 Not for use with cylinderMercury Inner Helm Extension Harness 50 Foot Extension 84 8M0173574 OverviewThis 50 foot inner engine extension harness is meant for big triple and quad engine boats where the normal harness just doesnt have the reach. When the run has to make its way through long rigging channels or around multiple bulkheads, this extension keeps you from stretching the wiring or bending it too sharply. It lets the harness follow a smooth, relaxed path so the