





⚡ Ignite your engine’s potential with Sierra’s trusted power switch!
The Sierra International MP39760 Medium Ignition Switch is a robust, marine-grade ignition control designed for universal fit and reliable 12V operation. Featuring corrosion-resistant aluminum contacts and a compact panel mount design, it meets or exceeds OEM standards, making it the go-to choice for boaters and vehicle owners seeking dependable engine ignition performance.



| Operation Mode | MOTOR |
| Current Rating | 1 Amps |
| Operating Voltage | 1 Volts |
| Contact Type | Normally Closed |
| Connector Type | Clamp |
| Brand | Sierra |
| Terminal | Marine |
| Item dimensions L x W x H | 1.62 x 4.87 x 7 inches |
| Circuit Type | 1-way |
| Mounting Type | Panel Mount |
| Actuator Type | Ignition |
| Contact Material | Aluminum |
| International Protection Rating | IP00 |
| Number of Positions | 1 |
| Lower Temperature Rating | 1 Degrees Fahrenheit |
| Upper Temperature Rating | 1 Degrees Fahrenheit |
| Control Method | Touch |
| Connectivity Protocol | X-10 |
| Color | white |
| Unit Count | 1.0 Count |
| Number of Items | 1 |
| Global Trade Identification Number | 00023121397606 |
| Manufacturer | Sierra |
| Vehicle Service Type | Boats, Passenger Cars, Trucks |
| Control Type | Power |
| Compatible Devices | Mercruiser engine vehicles |
| UPC | 732085331051 808282367657 023121397606 |
| Model | Sierra International MP39760 Medium Ignition Switch |
| Item Weight | 3.2 ounces |
| Product Dimensions | 1.62 x 4.87 x 7 inches |
| Item model number | MP39760 |
| Is Discontinued By Manufacturer | No |
| Exterior | Machined |
| Manufacturer Part Number | SR18.MP39760 |
| OEM Part Number | 508180, OMC 393301 |
| Mirror Lighting Type | Non-Illuminated |
| Voltage | 12 Volts |
G**B
works in gas ezgo
fit and works
A**R
15 min. Install time.
Product came just fine , 3 position , push to choke , same number of terminals as the one I was replacing. Very easy to transfer wires one at a time from old to new in same position. Did not have to deal with wire colors just matched the position. Total install time 15 min. And works perfect. Look at the terminal positions on your boat and match that up to a new one with the same number of terminals located in the same positions as yours are , and make sure your choosing from the right catagories .....2 position or 3 position etc. and you should be fine.
C**B
Awesome price for product
Don't waste money buying at a boat shop, they wanted $85 for the same type of key switch. The only difference was the housing being plastic vs metal on the boat shop one. Guess what, I can buy multiple new ones for that $85 price. This product was a steal and works perfectly. Hook up was easy and brief instructions made sense. It is nice having options for both types of hook ups too. Great product!
E**N
Good switch, not a direct or easy swap
Ignition switch works great, however the terminals are not in the same layout as original in my 1978 Evinrude Power Pilot. I had to extend and reroute the main power wire (B) to avoid contacting the magneto (M) wire because the factory doesn't leave much slack.Also, the installation diagram wasn't 100% accurate, which combined with difficult-to-read terminal labels, resulted in me miswiring the switch at first.This ignition switch was not a direct replacement - it is designed to be screwed onto a plate/panel, whereas my original has the aforementioned plate/panel built in. I had to make a plate out of plastic using the original switch as a template and drill a hole in the middle to mount the new switch.
B**N
Works great for my 1968 chrysler 45hp outboard
Works great. I bought a boat with a 1968 chrysler outboard that didnt have a key. I bought this ignition switch and it was easy to install and in 10 minutes had the outboard running.
T**R
good but terminals are a little crowded
This key switch covers all of your ignition needs.This key switch has a contact for each position. Key off, Key On, Crank and push in for choke.If you have a magneto or an electronic ignition this key switch will work. Now you have to use the correct pin on the back of the switch so get that ohm meter out.this is a good key switch if you have an outboard which has an electric choke. I think the magneto switch is separate / does not share a common connection.
S**7
Replaced ignition on '85 Evinrude 25hp outboard
This was a drop-in replacement and worked well. The terminals were labeled slightly different than the original, but it was obvious which way everything went.
S**L
Fits 77 power pilot with 78 115 evinrude
Perfect fit for my 77 Power Pilot control box and 78 115hp evinrude. Wired up in 10min.I is A on ignitionJust write down where your wires are, this is not a direct switch out for the power pilot. First ignition install and i nailed it first try.. if you lost your keys, this is your cheapest option.
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