Sierra MP39190 Replacement Ignition Switch Boot – Fits Sierra Polyester Switches, 1996 & Later
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Sierra MP39190 Replacement Ignition Switch Boot – Fits Sierra Polyester Switches, 1996 & Later
Keep moisture and dust out of your ignition switch with the Sierra MP39190 replacement boot. Designed to fit all Sierra polyester ignition switches from 1996 and later, this rubber boot installs directly over the switch cylinder and creates a weather-resistant seal at the helm panel. The rotating rubber seal allows the switch to turn freely while maintaining full protection — an easy upgrade for any Sierra polyester switch that didn’t come with a boot, or a direct replacement when an existing boot cracks or deteriorates.
The 13/16"-16 thread ensures a secure, rattle-free fit on compatible Sierra switch cylinders.
Key Specifications
- Part Number: 11-MP39190
- Compatibility: All Sierra polyester ignition switches, 1996 and later
- Thread: 13/16"-16
- Seal Type: Rotating rubber seal
- Protection: Seals out moisture and dust
- Material: Rubber
Compatible Applications
- Sierra MP39760 Magneto Ignition Switch (no boot included)
- Sierra MP39770 Conventional Ignition Switch
- Sierra MP39780 Compact Conventional Ignition Switch (no boot included)
- Sierra MP39090 Magneto 6-Screw Ignition Switch (no boot included)
- Sierra MP39100 Magneto 5-Screw Ignition Switch (no boot included)
- Sierra MP39800 4-Position Conventional Ignition Switch (no boot included)
- All Sierra polyester ignition switches manufactured 1996 and later with 13/16"-16 thread
Parts Desk Insights
The MP39190 is the right pick when you have a Sierra polyester ignition switch that didn’t come with a boot — several switches in the Sierra lineup ship without one, and an exposed switch on a helm panel is vulnerable to spray, salt, and UV degradation over time. This boot is also the correct replacement when an existing boot cracks or no longer seals properly. If you’re buying a new switch and want the boot included from the factory, the Sierra MP41030 Compact Conventional Switch and the Sierra MP39770 Conventional Switch both include a boot in the box.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.