








⚡ Upgrade your start game with unstoppable power and durability!
The Upgrade Max 300A 12V solenoid features a robust 14Ω coil resistance and a 10.2W power rating, delivering up to 300 amps transient current for heavy-duty applications like golf carts, winches, and marine equipment. Its nickel-plated cover ensures rust resistance and environmental compliance, while precision bracket mounting guarantees a secure fit. Designed for starter use with copper contacts and a recommended cool-down period, this solenoid combines durability and performance for professional-grade reliability.




| ASIN | B0B93J9ZX2 |
| Best Sellers Rank | #4,967 in Automotive ( See Top 100 in Automotive ) #1 in Automotive Replacement Starter Solenoids |
| Brand | MaySpare |
| Brand Name | MaySpare |
| Coil Resistance | 14 Ohms |
| Coil Voltage | 12 Volts (DC) |
| Connector Type | Through Hole |
| Contact Current Rating | 300 Amps |
| Contact Material | Copper |
| Contact Type | Normally Open |
| Current Rating | 300 Amps |
| Customer Reviews | 4.3 out of 5 stars 2,815 Reviews |
| Item Type Name | Solenoid |
| Manufacturer | May Spare Parts |
| Minimum Switching Voltage | 12 Volts (DC) |
| Mounting Type | Screw Mount |
| Operating Time | 50 Minutes |
| Operation Mode | Automatic |
| Specification Met | Oem, Environmental Compliance |
| Warranty Description | 1year |
| Wattage | 10.2 watts |
M**1
Working great on my Exmark.
Installed this on an Exmark with a Briggs & Stratton engine. Working great but the mounting holes in the feet seem too close under the bigger cables. It was a bit tight to tighten the nuts.
D**R
Happy customer
Fair price,good quality product
D**.
VTX1800
Used to replace the oe solenoid for my vtx1800. That bike has eaten 5 in 15 years with the genuine Honda part lasting a few years vs the 1-2year Amazon specials. This style fortunately uses a cable ground, so your kickstand and neutral safeties still function. Fits neatly in the oe location, and handles the in-rush current like a champ. Faster cranks than the tiny solenoid could handle. Time will tell
M**K
ground the other small wire
worked as it should,the two small wires one is what i call the trigger wire and the other Must be grounded.
M**I
Exactly as described, good quality and great price.
Exactly as described, good quality and great price.
C**R
Short use and fear of fire
I purchased this product because I needed a continuous duty solenoid to keep two 12v batteries wired in parallel charged while driving the vehicle but not engaged while the engine is off, so my engine battery would not lose its charge because of the two house batteries draining it without my knowledge. It took some time to install the system and get my Chevy cargo van ready for some distance camping. But even before I left town, I discovered that the solenoid was getting hotter than I could even touch and my automatic breaker kept cycling. The odd thing was that I didn't have my inverter turned on nor any of my inside lighting (which wouldn't have been much). The only thing that was going on was the solenoid providing power from the alternator to keep the two house batteries charged. Nothing on the device indicates it's a continuous duty device and nothing on the device indicates the rated amperage. I'm quite disappointed that the device I purchased didn't even last for a single camping trip but gave me enough unrest, over perhaps suddenly bursting into flames, that I disconnected the device. And since I purchased the device June of 2019 and it's now August of 2020, I can't even return it for a refund. So, it's a total bust and I would caution other buyers to be aware and make certain you thoroughly check it out before getting into a desolate area and finding that it's just not what it should be.
J**.
Works
Easy install
B**G
12 volt starting solenoid
Exactly as described, good replacement starting solenoid
Trustpilot
5 days ago
2 weeks ago