

⚡ Start Strong, Stay Smooth – The Ultimate 12V Heavy-Duty Solenoid!
The Max 300A Heavy Duty Solenoid Relay is a premium 12V DC starter solenoid designed for golf carts, winches, and marine applications. Featuring a robust 300A transient current capacity, nickel-plated corrosion-resistant cover, and precision copper contacts, it guarantees reliable, long-lasting performance. Compatible with numerous OEM parts and engineered for easy bracket mounting, this solenoid is the go-to upgrade for professionals demanding durability and efficiency in heavy-duty electrical switching.











| ASIN | B072MZHK48 |
| Amperage | 150 Amps |
| Best Sellers Rank | #4,045 in Automotive ( See Top 100 in Automotive ) #1 in Automotive Replacement Starter Solenoids |
| Brand | MaySpare |
| Coil Resistance | 14 Ohms |
| Coil Voltage | 12 Volts |
| Connector Type | Screw |
| Contact Current Rating | 300 Amps |
| Contact Material | Copper |
| Contact Type | Normally Open |
| Current Rating | 300 Amps |
| Customer Reviews | 4.3 4.3 out of 5 stars (2,799) |
| Date First Available | June 30, 2017 |
| Exterior | Metallic Finish |
| Is Discontinued By Manufacturer | No |
| Item Weight | 13.4 ounces |
| Manufacturer | MaySpare |
| Manufacturer Part Number | CA-JD4T300A |
| Minimum Switching Voltage | 12 Volts (DC) |
| Model | SA-4201, SAS-4201, SAS-4202, SAS-4213, SAS-5201A, SAS-5203, SAS-5203A, SWX-88 |
| Mounting Type | 2 hole mount flange |
| OEM Part Number | 15-132, 15-133, 15-236, 15-311, 15-316, 15-88, EZGO 16542G1, Trombetta 974-1215-011-09, 974-1215-011, 98226-9 |
| Operation Mode | Automatic |
| Package Dimensions | 3.58 x 3.11 x 3.03 inches |
| Specification Met | Mayspare Quality Standard |
| Voltage | 12 Volts |
| 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.
B**G
12 volt starting solenoid
Exactly as described, good replacement starting solenoid
J**Y
Good relay for cheap
Nice relay for snow plow and cheap. Is holding up nice for about 25 driveways now.
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.
K**N
Stupid dues paid for this replacement
Bought this replacement for a perfectly good one that I had on my JCB for years, one that I ruined by being stupid. The new one is a heavy duty one 200amp that is exact replacement that got here super quick. If it works like the one I stupidwrecked I will be most happy.
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.
L**T
Great Service
Great Product & Great Service
J**O
Selenoid
When install this solenoid i was shock it performed so well/ recomend
J**S
Works perfect not exact fit for omc oem solenoid have to drill new mounting holes
T**M
Work as they should. Wired up a pair to repair failed solenoids on my older 3 wire motor RV slide control system. Nice that control grounds through body so no additional ground wire needed.
S**R
Ok.. not best quality. Get what you pay for. Like color
N**Y
Works well and as expected
V**R
My Yanmar 40hp inboard diesel was giving me starter fits. After replacing the starter and solenoid, still did not work - just "click". Then I removed the starter relay and discovered it was rusted out. Vancouver Outboard quoted a new starter relay switch at close to $400 and rush shipping charges. I paid $30 for this part and it can handle 200 amps. Works like a top so far.
Trustpilot
4 days ago
2 weeks ago