Will a 36V Solenoid Work on 48V?

Quick answer: No, a 36V solenoid should not be used on a 48V system. While the main high-amperage contacts can physically handle 48V (they are simply copper surfaces that touch), the activation coil is specifically wound for 36V. Applying 48V to a 36V coil increases current draw by 33%, causing rapid overheating, insulation breakdown, and premature coil failure. Always install a solenoid rated for your exact system voltage.

01 // Why the Coil Voltage Rating Matters

A solenoid has two electrically independent circuits inside the same housing. The main contacts (large posts) are just heavy copper pads that slam together — they do not care about voltage. The activation coil (small posts) is a precision-wound electromagnetic component designed for a specific voltage.

The coil’s wire gauge, number of turns, and insulation rating are all calculated for its rated voltage. When you apply 48V to a coil designed for 36V, Ohm’s law takes over:

• At 36V (rated): If the coil resistance is 60Ω, current = 36V / 60Ω = 0.6A. Power = 36V × 0.6A = 21.6W. The coil is designed to dissipate this amount of heat safely.
• At 48V (overvoltage): Current = 48V / 60Ω = 0.8A. Power = 48V × 0.8A = 38.4W. That is a 78% increase in heat dissipation that the coil was never designed to handle.

This extra heat rapidly degrades the thin enamel insulation on the coil windings. Once the insulation breaks down, adjacent turns short together, reducing the coil’s inductance and further increasing current draw — a thermal runaway loop that ends with a burnt coil and a dead solenoid.

02 // What Actually Happens When You Try It

Many owners report that a 36V solenoid “works fine” on 48V initially. And it does, technically. The contacts will close, the cart will move. But the clock is ticking.

1. Week 1-4: The solenoid functions normally. The coil runs hotter than designed, but the thermal mass of the housing absorbs the excess heat during short drive cycles.
2. Month 2-3: The coil insulation begins to degrade. You may notice the solenoid housing is noticeably hot after driving. The coil resistance starts to drift lower as insulation breaks down and partial winding shorts develop.
3. Month 4-6: The coil draws significantly more current than designed due to multiple shorted turns. The click becomes weaker. Intermittent failures begin as the coil struggles to generate enough magnetic force to pull the plunger against the return spring.
4. Failure: The coil burns out entirely (open circuit), or the excessive coil current melts the small-post connector wires, or the overheating causes the main contacts to weld from thermal softening.

03 // Contacts Are Universal, Coils Are Not

It is important to understand that the main contact posts on a solenoid are voltage-agnostic. A 200-amp copper contact can switch 36V, 48V, 72V, or even higher — the contacts do not “know” what voltage is passing through them. The only limiting factor for the contacts is their current (amperage) rating. So when someone says a solenoid is “36V rated,” they are referring exclusively to the coil voltage, not the contact capacity. This is why upgrading from 36V to 48V requires replacing the solenoid entirely rather than just the coil — the coil is permanently sealed inside the housing. For guidance on choosing the right high-amperage solenoid for a conversion build, see our 400-amp solenoid upgrade guide.

04 // The Complete 36V to 48V Solenoid Checklist

If you are converting your golf cart from 36V to 48V, the solenoid is just one of several components that need to change. Here is the solenoid-related checklist:

1. Purchase a 48V-rated solenoid with an amperage rating that matches or exceeds your controller’s peak output. For stock controllers, a 200A solenoid is sufficient. For aftermarket controllers like Alltrax or Navitas, upgrade to a 400A unit.
2. Install a precharge resistor rated for 48V (250Ω, 10W). If you were using a precharge resistor on the 36V system, you may need to verify that its wattage rating is sufficient for the higher voltage. Our precharge resistor sizing guide covers the exact math.
3. Install a flyback diode (1N5408, 3A 1000V). The higher voltage produces a stronger inductive kickback when the coil de-energizes, making the diode even more critical on 48V systems.
4. Verify cable gauge. Higher voltage systems produce different current profiles. Ensure your main cables are adequate for the new amperage. See our cable voltage drop analysis.
5. Update the voltage reducer if you have 12V accessories. A 36V-to-12V reducer will not work on 48V. You need a unit rated for 48V input. See our universal voltage reducer guide.

05 // Can a 48V Solenoid Work on 36V?

The reverse scenario is less dangerous but still problematic. A 48V coil on a 36V system will under-perform because the coil does not receive enough voltage to generate full magnetic pull force. The plunger may not fully engage, causing the contacts to make weak, partial contact. This results in high resistance at the contact junction, excessive heat, and accelerated contact pitting. While a 48V solenoid on 36V will not burn out the coil, it will prematurely destroy the contacts. Always match the solenoid voltage to the system voltage.

06 // Are There Universal Solenoids?

Some heavy-duty aftermarket contactors (like the Albright SW200 series) are available in wide-range voltage coil options that cover 36V through 80V. These are the closest thing to a “universal” solenoid. They use a coil designed to operate safely across the full voltage range. If you are planning future voltage upgrades and want a solenoid that will grow with your build, these wide-range units are worth the investment. They typically cost $80 to $150, compared to $25 to $50 for a single-voltage unit. For help choosing the right one, browse our OEM vs. aftermarket parts guide.